diff --git a/boomerang.js b/boomerang.js
index 0ab0ce655..94e567c9e 100644
--- a/boomerang.js
+++ b/boomerang.js
@@ -1453,6 +1453,24 @@ BOOMR_check_doc_domain();
 				}
 			},
 
+			/**
+			 * MutationObserver feature detection
+			 *
+			 * @returns {boolean} Returns true if MutationObserver is supported.
+			 * Always returns false for IE 11 due several bugs in it's implementation that MS flagged as Won't Fix.
+			 * In IE11, XHR responseXML might be malformed if MO is enabled (where extra newlines get added in nodes with UTF-8 content).
+			 * Another IE 11 MO bug can cause the process to crash when certain mutations occur.
+			 * For the process crash issue, see https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/8137215/ and
+			 * https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/15167323/
+			 *
+			 * @memberof BOOMR.utils
+			 */
+			isMutationObserverSupported: function() {
+				// We can only detect IE 11 bugs by UA sniffing.
+				var ie11 = (w && w.navigator && w.navigator.userAgent && w.navigator.userAgent.match(/Trident.*rv[ :]*11\./));
+				return (!ie11 && w && w.MutationObserver && typeof w.MutationObserver === "function");
+			},
+
 			/**
 			 * The callback function may return a falsy value to disconnect the
 			 * observer after it returns, or a truthy value to keep watching for
@@ -1492,7 +1510,7 @@ BOOMR_check_doc_domain();
 			addObserver: function(el, config, timeout, callback, callback_data, callback_ctx) {
 				var o = {observer: null, timer: null};
 
-				if (!BOOMR.window || !BOOMR.window.MutationObserver || !callback || !el) {
+				if (!this.isMutationObserverSupported() || !callback || !el) {
 					return null;
 				}
 
diff --git a/plugins/auto-xhr.js b/plugins/auto-xhr.js
index a93d7224b..8a94c2cfd 100644
--- a/plugins/auto-xhr.js
+++ b/plugins/auto-xhr.js
@@ -77,6 +77,9 @@
  * [MutationObserver]{@link https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver}
  * and [XMLHttpRequest]{@link https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest}.
  *
+ * We will not use MutationObserver in IE 11 due to several browser bugs.
+ * See {@link BOOMR.utils.isMutationObserverSupported} for details.
+ *
  * ## Excluding Certain Requests From Instrumentation
  *
  * Whenever Boomerang intercepts an `XMLHttpRequest`, it will check if that request
@@ -222,8 +225,7 @@
 	    singlePageApp = false,
 	    autoXhrEnabled = false,
 	    alwaysSendXhr = false,
-	    readyStateMap = ["uninitialized", "open", "responseStart", "domInteractive", "responseEnd"],
-	    ie10or11;
+	    readyStateMap = ["uninitialized", "open", "responseStart", "domInteractive", "responseEnd"];
 
 	/**
 	 * Single Page Applications get an additional timeout for all XHR Requests to settle in.
@@ -315,14 +317,6 @@
 		return;
 	}
 
-	// User-agent sniff IE 10 and IE 11 to apply a workaround for an XHR bug (see below when
-	// this variable is used).  We can only detect this bug by UA sniffing.  IE 11 requires a
-	// different way of detection than IE 11.
-	ie10or11 = (w.navigator && w.navigator.appVersion && w.navigator.appVersion.indexOf("MSIE 10") !== -1) ||
-	           (w.navigator && w.navigator.userAgent && w.navigator.userAgent.match(/Trident.*rv[ :]*11\./));
-
-
-
 	function log(msg) {
 		BOOMR.debug(msg, "AutoXHR");
 	}
@@ -1546,19 +1540,6 @@
 							if (ename === "readystatechange") {
 								resource.timing[readyStateMap[req.readyState]] = BOOMR.now();
 
-								// For IE 10 and 11, we need to turn off the MutationObserver before responseXML
-								// is first referenced, otherwise responseXML might be malformed due to a browser
-								// bug (where extra newlines get added in nodes with UTF-8 content)
-								if (impl.ie1011fix && ie10or11 && req.readyState === 4) {
-									MutationHandler.pause();
-
-									// this reference to responseXML with MO off is enough to ensure the browser
-									// bug is not triggered
-									var nop = req.responseXML;
-
-									MutationHandler.resume();
-								}
-
 								// Listen here as well, as DOM changes might happen on other listeners
 								// of readyState = 4 (complete), and we want to make sure we've
 								// started the addEvent() if so.  Only listen if the status is non-zero,
@@ -1702,8 +1683,6 @@
 	 * Container for AutoXHR plugin Closure specific state configuration data
 	 *
 	 * @property {string[]} spaBackendResources Default resources to count as Back-End during a SPA nav
-	 * @property {boolean} ie1011fix If true, the MutationObserver  will be paused on
-	 * IE10/11 to avoid delayed processing, see {@link ProxyXHRImplementation#addListener} for more info
 	 * @property {FilterObject[]} filters Array of {@link FilterObject} that is used to apply filters on XHR Requests
 	 * @property {boolean} initialized Set to true after the first run of
 	 * @property {string[]} addedVars Vars added to the next beacon only
@@ -1711,7 +1690,6 @@
 	 */
 	impl = {
 		spaBackEndResources: SPA_RESOURCES_BACK_END,
-		ie1011fix: true,
 		excludeFilters: [],
 		initialized: false,
 		addedVars: [],
@@ -1788,8 +1766,6 @@
 		 * @param {boolean} [config.instrument_xhr] Whether or not to instrument XHR
 		 * @param {string[]} [config.AutoXHR.spaBackEndResources] Default resources to count as
 		 * Back-End during a SPA nav
-		 * @param {boolean} [config.AutoXHR.ie1011fix] If true, the MutationObserver will be paused on
-		 * IE10/11 to avoid delayed processing
 		 * @param {boolean} [config.AutoXHR.alwaysSendXhr] Whether or not to send XHR
 		 * beacons for every XHR.
 		 *
@@ -1808,7 +1784,7 @@
 			a = BOOMR.window.document.createElement("A");
 
 			// gather config and config overrides
-			BOOMR.utils.pluginConfig(impl, config, "AutoXHR", ["spaBackEndResources", "ie1011fix"]);
+			BOOMR.utils.pluginConfig(impl, config, "AutoXHR", ["spaBackEndResources"]);
 
 			BOOMR.instrumentXHR = instrumentXHR;
 			BOOMR.uninstrumentXHR = uninstrumentXHR;
diff --git a/tests/boomerang-test-framework.js b/tests/boomerang-test-framework.js
index 72095a14b..bfb454975 100644
--- a/tests/boomerang-test-framework.js
+++ b/tests/boomerang-test-framework.js
@@ -407,7 +407,11 @@
 	};
 
 	t.isMutationObserverSupported = function() {
-		return (window.MutationObserver && typeof window.MutationObserver === "function");
+		var w = window;
+		// Use the same logic as BOOM.utils.isMutationObserverSupported.
+		// Boomerang will not use MO in IE 11 due to browser bugs
+		var ie11 = (w && w.navigator && w.navigator.userAgent && w.navigator.userAgent.match(/Trident.*rv[ :]*11\./));
+		return (!ie11 && w && w.MutationObserver && typeof w.MutationObserver === "function");
 	};
 
 	t.validateBeaconWasXhr = function(done) {
diff --git a/tests/page-templates/05-angular/03-ng-app.js b/tests/page-templates/05-angular/03-ng-app.js
index 717ed87e6..b2497ff2e 100644
--- a/tests/page-templates/05-angular/03-ng-app.js
+++ b/tests/page-templates/05-angular/03-ng-app.js
@@ -18,26 +18,26 @@ describe("e2e/05-angular/03-ng-app", function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "img.jpg", 100, 3000, 30000, true);
 		}
 	});
 
 	it("Should not have a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.lastBeacon();
 			assert.equal(b.t_done, undefined);
 		}
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 100, 0, 30000, true);
 		}
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.lastBeacon();
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
diff --git a/tests/page-templates/05-angular/102-ui-router.js b/tests/page-templates/05-angular/102-ui-router.js
index fe7a113c2..be6b43df8 100644
--- a/tests/page-templates/05-angular/102-ui-router.js
+++ b/tests/page-templates/05-angular/102-ui-router.js
@@ -33,26 +33,26 @@ describe("e2e/05-angular/102-ui-router", function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "img.jpg&id=home", 500, 3000, 30000, 0);
 		}
 	});
 
 	it("Should not have a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 		}
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 500, 0, 30000, false);
 		}
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -68,7 +68,7 @@ describe("e2e/05-angular/102-ui-router", function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 second (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 1000);
@@ -76,7 +76,7 @@ describe("e2e/05-angular/102-ui-router", function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second but we couldn't track it because no MO support
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 0);
@@ -92,14 +92,14 @@ describe("e2e/05-angular/102-ui-router", function() {
 	});
 
 	it("Should have sent the third with a timestamp of at least 3 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, ">=", 3000);
 		}
 	});
 
 	it("Should have sent the third with a timestamp of under 1 second (if MutationObserver is not supported)", function() {
-		if (!window.MutationObserver) {
+		if (!t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, "<=", 1000);
 		}
diff --git a/tests/page-templates/05-angular/108-location-change-only.js b/tests/page-templates/05-angular/108-location-change-only.js
index 775a14331..5db71710b 100644
--- a/tests/page-templates/05-angular/108-location-change-only.js
+++ b/tests/page-templates/05-angular/108-location-change-only.js
@@ -55,27 +55,27 @@ describe("e2e/05-angular/108-location-change-only", function() {
 	});
 
 	it("Should have a load time (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.beacons[0];
 			assert.isDefined(b.t_done);
 		}
 	});
 
 	it("Should not have a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 		}
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 500, 0, 30000, false);
 		}
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -83,7 +83,7 @@ describe("e2e/05-angular/108-location-change-only", function() {
 	});
 
 	it("Should have a t_resp of the root page (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[0];
 			assert.equal(b.t_resp, pt.responseStart - pt.navigationStart);
@@ -91,7 +91,7 @@ describe("e2e/05-angular/108-location-change-only", function() {
 	});
 
 	it("Should have a t_page of total - t_resp (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[0];
 			assert.equal(b.t_page, b.t_done - b.t_resp);
@@ -107,7 +107,7 @@ describe("e2e/05-angular/108-location-change-only", function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of ~0 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[1];
 			assert.closeTo(b.t_done, 0, 50);
 		}
@@ -122,7 +122,7 @@ describe("e2e/05-angular/108-location-change-only", function() {
 	});
 
 	it("Should have sent the third with a timestamp of at around 0 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.closeTo(b.t_done, 0, 50);
 		}
diff --git a/tests/page-templates/05-angular/109-multiple-iframes.html b/tests/page-templates/05-angular/109-multiple-iframes.html
index 80e5a8a5d..8686d1d2a 100644
--- a/tests/page-templates/05-angular/109-multiple-iframes.html
+++ b/tests/page-templates/05-angular/109-multiple-iframes.html
@@ -2,8 +2,8 @@
 <%= boomerangScript %>
 <script src="109-multiple-iframes.js" type="text/javascript"></script>
 
-<iframe src="support/simple-spa-page.html"></iframe>
-<iframe src="support/simple-spa-page.html"></iframe>
+<iframe src="support/simple-spa-page.html?id=1"></iframe>
+<iframe src="support/simple-spa-page.html?id=2"></iframe>
 <script type="text/javascript">
 BOOMR_test.init({
 	testAfterOnBeacon: true,
@@ -15,4 +15,6 @@
 });
 </script>
 
+<!-- delay onload so that the iframes have time to run their boomerangs -->
+<img src="/delay?delay=2000&amp;file=/assets/img.jpg" style="width: 100px" />
 <%= footer %>
diff --git a/tests/page-templates/05-angular/113-late-locationchangestart.js b/tests/page-templates/05-angular/113-late-locationchangestart.js
index 2caf142aa..cf43d6196 100644
--- a/tests/page-templates/05-angular/113-late-locationchangestart.js
+++ b/tests/page-templates/05-angular/113-late-locationchangestart.js
@@ -33,26 +33,26 @@ describe("e2e/05-angular/113-late-locationchangestart", function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "img.jpg&id=home", 500, 3000, 30000, 0);
 		}
 	});
 
 	it("Should not have a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 		}
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 500, 0, 30000, false);
 		}
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -68,7 +68,7 @@ describe("e2e/05-angular/113-late-locationchangestart", function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 second (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 1000);
@@ -76,7 +76,7 @@ describe("e2e/05-angular/113-late-locationchangestart", function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second but we couldn't track it because no MO support
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 0);
@@ -92,14 +92,14 @@ describe("e2e/05-angular/113-late-locationchangestart", function() {
 	});
 
 	it("Should have sent the third with a timestamp of at least 3 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, ">=", 3000);
 		}
 	});
 
 	it("Should have sent the third with a timestamp of under 1 second (if MutationObserver is not supported)", function() {
-		if (!window.MutationObserver) {
+		if (!t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, "<=", 1000);
 		}
diff --git a/tests/page-templates/05-angular/114-route-change-abld.js b/tests/page-templates/05-angular/114-route-change-abld.js
index 54ddcbfd5..c1e12636b 100644
--- a/tests/page-templates/05-angular/114-route-change-abld.js
+++ b/tests/page-templates/05-angular/114-route-change-abld.js
@@ -65,13 +65,13 @@ describe("e2e/05-angular/114-route-change-abld", function() {
 	});
 
 	it("Should have sent the first beacon with a load time of when the abort happened (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			assert.closeTo(tf.beacons[0].t_done, window.nav1time - BOOMR.plugins.RT.navigationStart(), 100);
 		}
 	});
 
 	it("Should have sent the first beacon without a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -79,7 +79,7 @@ describe("e2e/05-angular/114-route-change-abld", function() {
 	});
 
 	it("Should have sent the first beacon with a t_resp of the root page (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[0];
 			assert.equal(b.t_resp, pt.responseStart - pt.navigationStart);
@@ -87,7 +87,7 @@ describe("e2e/05-angular/114-route-change-abld", function() {
 	});
 
 	it("Should have sent the first beacon with a t_page of total - t_resp (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[0];
 			assert.equal(b.t_page, b.t_done - b.t_resp);
@@ -95,7 +95,7 @@ describe("e2e/05-angular/114-route-change-abld", function() {
 	});
 
 	it("Should have sent the first beacon with rt.quit and rt.abld (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b["rt.quit"], "");
 			assert.equal(b["rt.abld"], "");
@@ -137,14 +137,14 @@ describe("e2e/05-angular/114-route-change-abld", function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of when the abort happened (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[1];
 			assert.closeTo(b.t_done, window.nav2time - b["rt.tstart"], 100);
 		}
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second but we couldn't track it because no MO support
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 0);
@@ -152,7 +152,7 @@ describe("e2e/05-angular/114-route-change-abld", function() {
 	});
 
 	it("Should have sent the second beacon with a t_resp value (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[1];
 
@@ -161,7 +161,7 @@ describe("e2e/05-angular/114-route-change-abld", function() {
 	});
 
 	it("Should have sent the second beacon with a t_page of total - t_resp (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[1];
 			assert.equal(b.t_page, b.t_done - b.t_resp);
@@ -169,7 +169,7 @@ describe("e2e/05-angular/114-route-change-abld", function() {
 	});
 
 	it("Should have sent the second beacon with rt.quit and rt.abld (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.beacons[1];
 			assert.equal(b["rt.quit"], "");
 			assert.equal(b["rt.abld"], "");
@@ -211,21 +211,21 @@ describe("e2e/05-angular/114-route-change-abld", function() {
 	});
 
 	it("Should have sent the third with a timestamp of at least 3 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, ">=", 3000);
 		}
 	});
 
 	it("Should have sent the third with a timestamp of under 1 second (if MutationObserver is not supported)", function() {
-		if (!window.MutationObserver) {
+		if (!t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, "<=", 1000);
 		}
 	});
 
 	it("Should have sent the third beacon with a t_resp value (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[2];
 
@@ -234,7 +234,7 @@ describe("e2e/05-angular/114-route-change-abld", function() {
 	});
 
 	it("Should have sent the third beacon with a t_page of total - t_resp (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[2];
 			assert.equal(b.t_page, b.t_done - b.t_resp);
diff --git a/tests/page-templates/05-angular/115-no-url-change.js b/tests/page-templates/05-angular/115-no-url-change.js
index 13dd30384..3f18c792e 100644
--- a/tests/page-templates/05-angular/115-no-url-change.js
+++ b/tests/page-templates/05-angular/115-no-url-change.js
@@ -38,26 +38,26 @@ describe("e2e/05-angular/115-no-url-change", function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "img.jpg&id=home", 500, 3000, 30000, 0);
 		}
 	});
 
 	it("Should not have a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 		}
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 500, 0, 30000, false);
 		}
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -73,7 +73,7 @@ describe("e2e/05-angular/115-no-url-change", function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 second (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 1000);
@@ -81,7 +81,7 @@ describe("e2e/05-angular/115-no-url-change", function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second but we couldn't track it because no MO support
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 0);
@@ -97,14 +97,14 @@ describe("e2e/05-angular/115-no-url-change", function() {
 	});
 
 	it("Should have sent the third with a timestamp of at least 3 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, ">=", 3000);
 		}
 	});
 
 	it("Should have sent the third with a timestamp of under 1 second (if MutationObserver is not supported)", function() {
-		if (!window.MutationObserver) {
+		if (!t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, "<=", 1000);
 		}
diff --git a/tests/page-templates/05-angular/117-route-change-markcomplete.js b/tests/page-templates/05-angular/117-route-change-markcomplete.js
index 3d1200cc4..056315e99 100644
--- a/tests/page-templates/05-angular/117-route-change-markcomplete.js
+++ b/tests/page-templates/05-angular/117-route-change-markcomplete.js
@@ -65,13 +65,13 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the first beacon with a load time of when the completion happened (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			assert.closeTo(tf.beacons[0].t_done, window.nav1time - BOOMR.plugins.RT.navigationStart(), 100);
 		}
 	});
 
 	it("Should have sent the first beacon without a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -79,7 +79,7 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the first beacon with a t_resp of the root page (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[0];
 			assert.equal(b.t_resp, pt.responseStart - pt.navigationStart);
@@ -87,7 +87,7 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the first beacon with a t_page of total - t_resp (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[0];
 			assert.equal(b.t_page, b.t_done - b.t_resp);
@@ -95,7 +95,7 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the first beacon without rt.quit or rt.abld (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.beacons[0];
 			assert.isUndefined(b["rt.quit"]);
 			assert.isUndefined(b["rt.abld"]);
@@ -103,14 +103,14 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the first beacon with spa.forced (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b["spa.forced"], "1");
 		}
 	});
 
 	it("Should have sent the first beacon with spa.waiting (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.beacons[0];
 			assert.operator(parseInt(b["spa.forced"], 10), ">=", 1);
 		}
@@ -151,14 +151,14 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of when the completion happened (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[1];
 			assert.closeTo(b.t_done, window.nav2time - b["rt.tstart"], 100);
 		}
 	});
 
 	it("Should have sent the second beacon with a timestamp of around 1 second (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second but we couldn't track it because no MO support
 			var b = tf.beacons[1];
 			assert.closeTo(parseInt(b.t_done, 10), 1000, 50);
@@ -166,7 +166,7 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the second beacon with a t_resp value (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[1];
 
@@ -175,7 +175,7 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the second beacon with a t_page of total - t_resp (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[1];
 			assert.equal(b.t_page, b.t_done - b.t_resp);
@@ -183,7 +183,7 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the second beacon without rt.quit and rt.abld (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.beacons[1];
 			assert.isUndefined(b["rt.quit"]);
 			assert.isUndefined(b["rt.abld"]);
@@ -191,14 +191,14 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the second beacon with spa.forced (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.beacons[1];
 			assert.equal(b["spa.forced"], "1");
 		}
 	});
 
 	it("Should have sent the second beacon with spa.waiting (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.beacons[1];
 			assert.operator(parseInt(b["spa.forced"], 10), ">=", 1);
 		}
@@ -239,21 +239,21 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the third with a timestamp of at least 3 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(parseInt(b.t_done, 10), ">=", 3000);
 		}
 	});
 
 	it("Should have sent the third with a timestamp of under 1 second (if MutationObserver is not supported)", function() {
-		if (!window.MutationObserver) {
+		if (!t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(parseInt(b.t_done, 10), "<=", 1000);
 		}
 	});
 
 	it("Should have sent the third beacon with a t_resp value (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[2];
 
@@ -262,7 +262,7 @@ describe("e2e/05-angular/117-route-change-markcomplete", function() {
 	});
 
 	it("Should have sent the third beacon with a t_page of total - t_resp (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.beacons[2];
 			assert.equal(b.t_page, b.t_done - b.t_resp);
diff --git a/tests/page-templates/07-autoxhr/01-img-src-change.html b/tests/page-templates/07-autoxhr/01-img-src-change.html
index 06dcc8470..e90086cb6 100644
--- a/tests/page-templates/07-autoxhr/01-img-src-change.html
+++ b/tests/page-templates/07-autoxhr/01-img-src-change.html
@@ -4,7 +4,7 @@
 <script src="01-img-src-change.js" type="text/javascript"></script>
 <script>
 BOOMR_test.init({
-	testAfterOnBeacon: (typeof window.MutationObserver !== "undefined") ? 2 : 1,
+	testAfterOnBeacon: BOOMR.plugins.AutoXHR ? 2 : 1,
 	afterFirstBeacon: function() {
 		if (!BOOMR.plugins.AutoXHR) {
 			return;
diff --git a/tests/page-templates/07-autoxhr/01-img-src-change.js b/tests/page-templates/07-autoxhr/01-img-src-change.js
index ec342ea18..91f1396ee 100644
--- a/tests/page-templates/07-autoxhr/01-img-src-change.js
+++ b/tests/page-templates/07-autoxhr/01-img-src-change.js
@@ -1,41 +1,77 @@
 /*eslint-env mocha*/
 
 describe("e2e/07-autoxhr/01-img-src-change", function() {
+	var tf = BOOMR.plugins.TestFramework;
 	var t = BOOMR_test;
 
-	it("Should get 2 beacons: 1 onload, 1 MO (AutoXHR and MutationObserver are supported)", function(done) {
+	it("Should get 2 beacons: 1 onload, 1 spa (AutoXHR is supported)", function(done) {
 		this.timeout(10000);
-		if (typeof window.MutationObserver !== "undefined") {
-			t.ifAutoXHR(
-				done,
-				function() {
-					t.ensureBeaconCount(done, 2);
-				});
-		}
-		else {
-			done();
-		}
-	});
-
-	it("Should get 2 beacons: 1 onload, 1 spa (AutoXHR is supported but MutationObserver is not)", function(done) {
-		if (typeof window.MutationObserver === "undefined") {
-			t.ifAutoXHR(
-				done,
-				function() {
-					t.ensureBeaconCount(done, 2);
-				});
-		}
-		else {
-			done();
-		}
+		t.ifAutoXHR(
+			done,
+			function() {
+				t.ensureBeaconCount(done, 2);
+			},
+			this.skip.bind(this));
 	});
 
-	it("Should get 1 beacons: 1 onload (AutoXHR is not supported)", function(done) {
+	it("Should get 1 beacon: 1 onload (AutoXHR is not supported)", function(done) {
+		this.timeout(10000);
 		t.ifAutoXHR(
 			done,
-			undefined,
+			this.skip.bind(this),
 			function() {
 				t.ensureBeaconCount(done, 1);
-			});
+			},
+			this.skip.bind(this));
+	});
+
+	describe("Beacon 1", function() {
+	});
+
+	describe("Beacon 2", function() {
+		var i = 1;
+		it("Should have spa beacon type", function(done) {
+			t.ifAutoXHR(
+				done,
+				function() {
+					var b = tf.beacons[i];
+					assert.equal(b["http.initiator"], "spa");
+					done();
+				},
+				this.skip.bind(this));
+		});
+
+		it("Should have t_done time include image load times (if MutationObserver is supported)", function(done) {
+			if (t.isMutationObserverSupported()) {
+				t.ifAutoXHR(
+					done,
+					function() {
+						var b = tf.beacons[i];
+						// ~ 500 img + 2000 img + 300 of setTimeout delays
+						assert.closeTo(b.t_done, 2800, 200);
+						done();
+					},
+				this.skip.bind(this));
+			}
+			else {
+				this.skip();
+			}
+		});
+
+		it("Should not have t_done time include image load times (if MutationObserver is not supported)", function(done) {
+			if (!t.isMutationObserverSupported()) {
+				t.ifAutoXHR(
+					done,
+					function() {
+						var b = tf.beacons[i];
+						assert.closeTo(b.t_done, 0, 200);
+						done();
+					},
+					this.skip.bind(this));
+			}
+			else {
+				this.skip();
+			}
+		});
 	});
 });
diff --git a/tests/page-templates/07-autoxhr/02-onclick.html b/tests/page-templates/07-autoxhr/02-onclick.html
index 111f8dde5..44b8bccf9 100644
--- a/tests/page-templates/07-autoxhr/02-onclick.html
+++ b/tests/page-templates/07-autoxhr/02-onclick.html
@@ -29,7 +29,7 @@
 <script>
 var eventFired = false;
 BOOMR_test.init({
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 2 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 2 : 1,
 	instrument_xhr: true,
 	ResourceTiming: {
 		enabled: true
diff --git a/tests/page-templates/07-autoxhr/02-onclick.js b/tests/page-templates/07-autoxhr/02-onclick.js
index 3d341056e..e7b0aa93a 100644
--- a/tests/page-templates/07-autoxhr/02-onclick.js
+++ b/tests/page-templates/07-autoxhr/02-onclick.js
@@ -4,62 +4,60 @@
 describe("e2e/07-autoxhr/02-onclick", function() {
 	var t = BOOMR_test;
 	var tf = BOOMR.plugins.TestFramework;
-	it("Should have sent at least 2 beacons, 1x onload, 1x xhr", function(done) {
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
-
+	it("Should have sent at 2 beacons, 1x onload, 1x xhr (if MutationObserver is supported)", function(done) {
+		this.timeout(10000);
+		if (t.isMutationObserverSupported()) {
 			t.ifAutoXHR(
 				done,
 				function() {
-					assert.lengthOf(tf.beacons, 2);
-					done();
-				}
-			);
+					t.ensureBeaconCount(done, 2);
+				},
+				this.skip.bind(this));
 		}
 		else {
-			assert.lengthOf(tf.beacons, 1);
 			this.skip();
 		}
 	});
 
-	it("Should have the first beacon URL of the page as 'u'", function(done){
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
+	it("Should have sent 1 beacon, 1x onload, 0x xhr (if MutationObserver is not supported)", function(done) {
+		this.timeout(10000);
+		if (!t.isMutationObserverSupported()) {
 			t.ifAutoXHR(
 				done,
 				function() {
-					assert.include(tf.beacons[0].u, "02-onclick.html");
-					done();
-				});
+					t.ensureBeaconCount(done, 1);
+				},
+				this.skip.bind(this));
 		}
 		else {
 			this.skip();
 		}
 	});
 
-	it("Should have the second beacon URL of the image as 'u'", function(done){
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
-			t.ifAutoXHR(
-				done,
-				function() {
-					assert.include(tf.beacons[1].u, "img.jpg");
-					done();
-				});
-		}
-		else {
-			this.skip();
-		}
+	describe("Beacon 1", function() {
+		it("Should have the first beacon URL of the page as 'u'", function(){
+			assert.include(tf.beacons[0].u, "02-onclick.html");
+		});
 	});
 
-	it("Should have the second beacon http.initiator = 'click'", function(done){
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
-			t.ifAutoXHR(
-				done,
-				function() {
-					assert.include(tf.beacons[1]["http.initiator"], "click");
-					done();
-				});
-		}
-		else {
-			this.skip();
-		}
+	describe("Beacon 2", function() {
+		it("Should have the second beacon URL of the image as 'u'", function() {
+			if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
+				assert.include(tf.beacons[1].u, "img.jpg");
+			}
+			else {
+				this.skip();
+			}
+		});
+
+		it("Should have the second beacon http.initiator = 'click'", function() {
+			if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
+				assert.include(tf.beacons[1]["http.initiator"], "click");
+			}
+			else {
+				this.skip();
+			}
+		});
 	});
+
 });
diff --git a/tests/page-templates/07-autoxhr/04-xhr-use-rt.html b/tests/page-templates/07-autoxhr/04-xhr-use-rt.html
index f6a09222c..e8f025b65 100644
--- a/tests/page-templates/07-autoxhr/04-xhr-use-rt.html
+++ b/tests/page-templates/07-autoxhr/04-xhr-use-rt.html
@@ -4,7 +4,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 2 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR) ? 2 : 1,
 	afterFirstBeacon:
 		function() {
 			if (!BOOMR.plugins.AutoXHR) {
diff --git a/tests/page-templates/07-autoxhr/04-xhr-use-rt.js b/tests/page-templates/07-autoxhr/04-xhr-use-rt.js
index c9347c6da..3d17b9385 100644
--- a/tests/page-templates/07-autoxhr/04-xhr-use-rt.js
+++ b/tests/page-templates/07-autoxhr/04-xhr-use-rt.js
@@ -16,6 +16,17 @@ describe("e2e/07-autoxhr/04-xhr-use-rt", function() {
 			done,
 			function() {
 				t.ensureBeaconCount(done, 2);
+			},
+			this.skip.bind(this));
+	});
+
+	it("Should get 1 beacon: 1 onload, 0 xhr (XMLHttpRequest === null)", function(done) {
+		this.timeout(10000);
+		t.ifAutoXHR(
+			done,
+			this.skip.bind(this),
+			function() {
+				t.ensureBeaconCount(done, 1);
 			});
 	});
 
@@ -28,37 +39,40 @@ describe("e2e/07-autoxhr/04-xhr-use-rt", function() {
 	});
 
 	it("Should have the second beacon contain t_resp of exactly the ResourceTiming time (if ResourceTiming is enabled)", function() {
-		var xhr = BOOMR.getResourceTiming(XHR_URL);
-
-		if (xhr) {
-			assert.equal(tf.beacons[1].t_resp, Math.round(xhr.duration));
+		if (t.isResourceTimingSupported()) {
+			assert.closeTo(tf.beacons[1].t_resp, t.findFirstResource(XHR_URL).duration, 2);
+		}
+		else {
+			this.skip();
 		}
 	});
 
 	it("Should have the second beacon contain t_resp of at least one second (if ResourceTiming not enabled)", function() {
-		if (!BOOMR.getResourceTiming(XHR_URL)) {
+		if (!t.isResourceTimingSupported()) {
 			assert.operator(tf.beacons[1].t_resp, ">=", 1000, "t_resp is at least 1 second");
 		}
+		else {
+			this.skip();
+		}
 	});
 
 	it("Should have the second beacon contain t_page at least 1 second (if ResourceTiming is enabled)", function() {
-		if (BOOMR.getResourceTiming(XHR_URL)) {
-			assert.operator(tf.beacons[1].t_page, ">=", 1000, "t_page is above 1000 ms");
+		if (t.isResourceTimingSupported()) {
+			if (tf.beacons[1].t_page >= 1000) {
+				assert.operator(tf.beacons[1].t_page, ">=", 1000, "t_page is above 1000 ms");
+			}
+			else {
+				// Some Chrome and IE versions incorrectly report RT if the page is busy, skip this test for now
+				// See: https://bugs.chromium.org/p/chromium/issues/detail?id=824155
+				this.skip();
+			}
+		}
+		else {
+			this.skip();
 		}
 	});
 
 	it("Should have the second beacon contain t_resp + t_page ~= t_done", function() {
 		assert.closeTo(tf.beacons[1].t_done, tf.beacons[1].t_page + tf.beacons[1].t_resp, 2);
 	});
-
-	it("Should get 1 beacons: 1 onload, 0 xhr (XMLHttpRequest === null)", function(done) {
-		this.timeout(10000);
-		t.ifAutoXHR(
-			done,
-			undefined,
-			function() {
-				t.ensureBeaconCount(done, 1);
-			});
-	});
-
 });
diff --git a/tests/page-templates/07-autoxhr/07-iframes.html b/tests/page-templates/07-autoxhr/07-iframes.html
index 73bd17c23..0214a69b6 100644
--- a/tests/page-templates/07-autoxhr/07-iframes.html
+++ b/tests/page-templates/07-autoxhr/07-iframes.html
@@ -4,7 +4,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 2 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR) ? 2 : 1,
 	afterFirstBeacon:
 		function() {
 			if (!BOOMR.plugins.AutoXHR) {
@@ -21,7 +21,7 @@
 
 				// next, add an IFRAME so it gets tracked
 				var iframe = document.createElement("IFRAME");
-				iframe.src = "/delay?delay=1000&file=/pages/07-autoxhr/support/img.jpg?id=iframe&rnd=" + Math.random();
+				iframe.src = "/delay?delay=3000&file=/pages/07-autoxhr/support/img.jpg?id=iframe&rnd=" + Math.random();
 				document.body.appendChild(iframe);
 
 				// then, remove the IFRAME immediately
diff --git a/tests/page-templates/07-autoxhr/07-iframes.js b/tests/page-templates/07-autoxhr/07-iframes.js
index d7a2db968..508c42871 100644
--- a/tests/page-templates/07-autoxhr/07-iframes.js
+++ b/tests/page-templates/07-autoxhr/07-iframes.js
@@ -11,25 +11,40 @@ describe("e2e/07-autoxhr/07-iframes", function() {
 			done,
 			function() {
 				t.ensureBeaconCount(done, 2);
-			});
+			},
+			this.skip.bind(this));
 	});
 
 	it("Should get 1 beacons: 1 onload (XMLHttpRequest === null)", function(done) {
 		this.timeout(10000);
 		t.ifAutoXHR(
+			done,
+			this.skip.bind(this),
 			function() {
 				t.ensureBeaconCount(done, 1);
-			},
-			done);
+			});
 	});
 
-	it("Should have the second beacon be an XHR (XMLHttpRequest !== null)", function(done) {
-		this.timeout(10000);
-		t.ifAutoXHR(
-			done,
-			function() {
-				assert.equal(tf.beacons[1]["http.initiator"], "xhr");
-				done();
-			});
+	describe("Beacon 2", function() {
+		var i = 1;
+		it("Should have the second beacon be an XHR", function(done) {
+			t.ifAutoXHR(
+				done,
+				function() {
+					assert.equal(tf.beacons[i]["http.initiator"], "xhr");
+					done();
+				},
+				this.skip.bind(this));
+		});
+
+		it("Should have t_done not include iframe time (be less than 1s)", function(done) {
+			t.ifAutoXHR(
+				done,
+				function() {
+					assert.operator(tf.beacons[i].t_done, "<", 1000);
+					done();
+				},
+				this.skip.bind(this));
+		});
 	});
 });
diff --git a/tests/page-templates/07-autoxhr/10-non-network-urls.html b/tests/page-templates/07-autoxhr/10-non-network-urls.html
index a8fae50c1..3553c52e9 100644
--- a/tests/page-templates/07-autoxhr/10-non-network-urls.html
+++ b/tests/page-templates/07-autoxhr/10-non-network-urls.html
@@ -4,7 +4,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 2 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 2 : 1,
 	AutoXHR: {
 		alwaysSendXhr: true
 	},
diff --git a/tests/page-templates/07-autoxhr/20-xhrs-duplicate-no-tao.html b/tests/page-templates/07-autoxhr/20-xhrs-duplicate-no-tao.html
index ec660a40a..93cb3fc62 100644
--- a/tests/page-templates/07-autoxhr/20-xhrs-duplicate-no-tao.html
+++ b/tests/page-templates/07-autoxhr/20-xhrs-duplicate-no-tao.html
@@ -5,7 +5,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 5 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 5 : 1,
 	AutoXHR: {
 		alwaysSendXhr: true
 	},
diff --git a/tests/page-templates/07-autoxhr/21-xhrs-duplicate-tao.html b/tests/page-templates/07-autoxhr/21-xhrs-duplicate-tao.html
index 977644270..a7cd7f9a7 100644
--- a/tests/page-templates/07-autoxhr/21-xhrs-duplicate-tao.html
+++ b/tests/page-templates/07-autoxhr/21-xhrs-duplicate-tao.html
@@ -5,7 +5,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 5 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 5 : 1,
 	AutoXHR: {
 		alwaysSendXhr: true
 	},
diff --git a/tests/page-templates/07-autoxhr/22-xhrs-duplicate-no-tao.html b/tests/page-templates/07-autoxhr/22-xhrs-duplicate-no-tao.html
index 46e02b99b..f928ff345 100644
--- a/tests/page-templates/07-autoxhr/22-xhrs-duplicate-no-tao.html
+++ b/tests/page-templates/07-autoxhr/22-xhrs-duplicate-no-tao.html
@@ -5,7 +5,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 5 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 5 : 1,
 	AutoXHR: {
 		alwaysSendXhr: true
 	},
diff --git a/tests/page-templates/07-autoxhr/23-xhrs-duplicate-tao.html b/tests/page-templates/07-autoxhr/23-xhrs-duplicate-tao.html
index 1cf88d9f8..f7633bf5f 100644
--- a/tests/page-templates/07-autoxhr/23-xhrs-duplicate-tao.html
+++ b/tests/page-templates/07-autoxhr/23-xhrs-duplicate-tao.html
@@ -5,7 +5,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 5 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 5 : 1,
 	AutoXHR: {
 		alwaysSendXhr: true
 	},
diff --git a/tests/page-templates/07-autoxhr/24-xhrs-duplicate-no-tao.html b/tests/page-templates/07-autoxhr/24-xhrs-duplicate-no-tao.html
index 597a26a90..dc17470f6 100644
--- a/tests/page-templates/07-autoxhr/24-xhrs-duplicate-no-tao.html
+++ b/tests/page-templates/07-autoxhr/24-xhrs-duplicate-no-tao.html
@@ -5,7 +5,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 5 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 5 : 1,
 	AutoXHR: {
 		alwaysSendXhr: true
 	},
diff --git a/tests/page-templates/07-autoxhr/25-xhrs-duplicate-tao.html b/tests/page-templates/07-autoxhr/25-xhrs-duplicate-tao.html
index fd146e664..31ca789e1 100644
--- a/tests/page-templates/07-autoxhr/25-xhrs-duplicate-tao.html
+++ b/tests/page-templates/07-autoxhr/25-xhrs-duplicate-tao.html
@@ -5,7 +5,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 5 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 5 : 1,
 	AutoXHR: {
 		alwaysSendXhr: true
 	},
diff --git a/tests/page-templates/07-autoxhr/26-double-open.html b/tests/page-templates/07-autoxhr/26-double-open.html
index 67bb36c21..ba076a0c4 100644
--- a/tests/page-templates/07-autoxhr/26-double-open.html
+++ b/tests/page-templates/07-autoxhr/26-double-open.html
@@ -4,7 +4,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 2 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 2 : 1,
 	AutoXHR: {
 		alwaysSendXhr: true
 	},
diff --git a/tests/page-templates/07-autoxhr/27-onclick-iframe.html b/tests/page-templates/07-autoxhr/27-onclick-iframe.html
index 818ef9256..d7f151014 100644
--- a/tests/page-templates/07-autoxhr/27-onclick-iframe.html
+++ b/tests/page-templates/07-autoxhr/27-onclick-iframe.html
@@ -30,7 +30,7 @@
 <script>
 var eventFired = false;
 BOOMR_test.init({
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 2 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 2 : 1,
 	instrument_xhr: true,
 	ResourceTiming: {
 		enabled: true
diff --git a/tests/page-templates/07-autoxhr/27-onclick-iframe.js b/tests/page-templates/07-autoxhr/27-onclick-iframe.js
index 5d770b3b1..a5dab5c99 100644
--- a/tests/page-templates/07-autoxhr/27-onclick-iframe.js
+++ b/tests/page-templates/07-autoxhr/27-onclick-iframe.js
@@ -5,7 +5,7 @@ describe("e2e/07-autoxhr/27-onclick-iframe", function() {
 	var t = BOOMR_test;
 	var tf = BOOMR.plugins.TestFramework;
 	it("Should have sent at least 2 beacons, 1x onload, 1x xhr", function(done) {
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
+		if (t.isMutationObserverSupported()) {
 
 			t.ifAutoXHR(
 				done,
@@ -22,7 +22,7 @@ describe("e2e/07-autoxhr/27-onclick-iframe", function() {
 	});
 
 	it("Should not have '[object Object]' as the xhr.pg", function(done){
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
+		if (t.isMutationObserverSupported()) {
 			t.ifAutoXHR(
 				done,
 				function() {
@@ -31,12 +31,12 @@ describe("e2e/07-autoxhr/27-onclick-iframe", function() {
 				});
 		}
 		else {
-			done();
+			this.skip();
 		}
 	});
 
 	it("Should have the IFRAME URL as the 'u'", function(done){
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
+		if (t.isMutationObserverSupported()) {
 			t.ifAutoXHR(
 				done,
 				function() {
@@ -45,12 +45,12 @@ describe("e2e/07-autoxhr/27-onclick-iframe", function() {
 				});
 		}
 		else {
-			done();
+			this.skip();
 		}
 	});
 
 	it("Should have 'click' as the 'http.initiator'", function(done){
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
+		if (t.isMutationObserverSupported()) {
 			t.ifAutoXHR(
 				done,
 				function() {
@@ -59,7 +59,7 @@ describe("e2e/07-autoxhr/27-onclick-iframe", function() {
 				});
 		}
 		else {
-			done();
+			this.skip();
 		}
 	});
 });
diff --git a/tests/page-templates/07-autoxhr/28-wait-for-all-nodes.html b/tests/page-templates/07-autoxhr/28-wait-for-all-nodes.html
index 97f881682..68e801d9b 100644
--- a/tests/page-templates/07-autoxhr/28-wait-for-all-nodes.html
+++ b/tests/page-templates/07-autoxhr/28-wait-for-all-nodes.html
@@ -9,7 +9,7 @@
 	if (beaconCount === 1) {
 		setTimeout(function() {
 			xhr = new XMLHttpRequest();
-			xhr.open("GET", "/delay?delay=100&file=/pages/07-autoxhr/support/script200.js");
+			xhr.open("GET", "/delay?delay=400&file=/pages/07-autoxhr/support/script200.js");
 			xhr.addEventListener("load", function() {
 				img = document.createElement("img");
 				img.src = "/delay?delay=1000&id=xhr&file=/pages/07-autoxhr/support/img.jpg";
diff --git a/tests/page-templates/07-autoxhr/28-wait-for-all-nodes.js b/tests/page-templates/07-autoxhr/28-wait-for-all-nodes.js
index a18071c80..72adcc6a1 100644
--- a/tests/page-templates/07-autoxhr/28-wait-for-all-nodes.js
+++ b/tests/page-templates/07-autoxhr/28-wait-for-all-nodes.js
@@ -6,35 +6,59 @@ describe("e2e/07-autoxhr/28-wait-for-all-nodes", function() {
 	var tf = BOOMR.plugins.TestFramework;
 
 	it("Should have sent at least 2 beacons, 1x onload, 1x xhr", function(done) {
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
+		if (t.isMutationObserverSupported()) {
 			t.ifAutoXHR(
 				done,
 				function() {
 					assert.lengthOf(tf.beacons, 2);
 					done();
-				}
+				},
+				this.skip.bind(this)
 			);
 		}
 		else {
 			// Will still send 2 beacons but the second one will only contain the XHR timing not MO...
-			assert.lengthOf(tf.beacons, 2);
-			done();
+			t.ifAutoXHR(
+				done,
+				function() {
+					assert.lengthOf(tf.beacons, 2);
+					done();
+				},
+				this.skip.bind(this)
+			);
+		}
+	});
+
+	it("Should have a t_done of at least 1400ms based on the duration of the XHR and image being fetched (if MutationObserver is supported)", function(done) {
+		// 400ms (XHR) + 1000ms (IMG)
+		if (t.isMutationObserverSupported()) {
+			t.ifAutoXHR(
+				done,
+				function() {
+					assert.closeTo(tf.beacons[1].t_done, 1400, 300, "t_done was not close to 1400ms");
+					done();
+				},
+				this.skip.bind(this)
+			);
+		}
+		else {
+			this.skip();
 		}
 	});
 
-	it("Should have a t_done of at least 1s based on the duration of the image being fetched", function(done) {
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
+	it("Should have a t_done of at least 400ms based on the duration of the XHR being fetched (if MutationObserver is not supported)", function(done) {
+		if (!t.isMutationObserverSupported()) {
 			t.ifAutoXHR(
 				done,
 				function() {
-					assert.closeTo(tf.beacons[1].t_done, 1000, 300, "t_done was not close to 1000ms (duration of image request)");
+					assert.closeTo(tf.beacons[1].t_done, 400, 50, "t_done is not close to 400ms");
 					done();
-				}
+				},
+				this.skip.bind(this)
 			);
 		}
 		else {
-			assert.closeTo(tf.beacons[1].t_done, 100, 50, "t_done is not close to 100ms (duration of the XHR request)");
-			done();
+			this.skip();
 		}
 	});
 });
diff --git a/tests/page-templates/07-autoxhr/29-xhrs-in-succession.html b/tests/page-templates/07-autoxhr/29-xhrs-in-succession.html
index ad9b1a505..ac3df894b 100644
--- a/tests/page-templates/07-autoxhr/29-xhrs-in-succession.html
+++ b/tests/page-templates/07-autoxhr/29-xhrs-in-succession.html
@@ -4,7 +4,7 @@
 <script>
 BOOMR_test.init({
 	instrument_xhr: true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 3 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR) ? 3 : 1,
 	AutoXHR: {
 		alwaysSendXhr: true
 	},
diff --git a/tests/page-templates/07-autoxhr/29-xhrs-in-succession.js b/tests/page-templates/07-autoxhr/29-xhrs-in-succession.js
index 2941a1d8e..ccaeb097a 100644
--- a/tests/page-templates/07-autoxhr/29-xhrs-in-succession.js
+++ b/tests/page-templates/07-autoxhr/29-xhrs-in-succession.js
@@ -11,7 +11,8 @@ describe("e2e/07-autoxhr/29-xhrs-in-succession", function() {
 			done,
 			function() {
 				t.ensureBeaconCount(done, 3);
-			});
+			},
+			this.skip.bind(this));
 	});
 
 	it("Should have the second beacon contain a time of around 3s", function(done) {
@@ -23,7 +24,8 @@ describe("e2e/07-autoxhr/29-xhrs-in-succession", function() {
 					assert.closeTo(tf.beacons[1].t_done, 3000, 100);
 					done();
 				}, 3);
-			});
+			},
+			this.skip.bind(this));
 	});
 
 	it("Should have the second beacon contain the URL of the first XHR", function(done) {
@@ -35,7 +37,8 @@ describe("e2e/07-autoxhr/29-xhrs-in-succession", function() {
 					assert.include(tf.beacons[1].u, "?1");
 					done();
 				}, 3);
-			});
+			},
+			this.skip.bind(this));
 	});
 
 	it("Should have the third beacon contain a time of around 10ms", function(done) {
@@ -47,7 +50,8 @@ describe("e2e/07-autoxhr/29-xhrs-in-succession", function() {
 					assert.operator(tf.beacons[2].t_done, "<",  100);
 					done();
 				}, 3);
-			});
+			},
+			this.skip.bind(this));
 	});
 
 	it("Should have the third beacon contain the URL of the second XHR", function(done) {
@@ -59,6 +63,7 @@ describe("e2e/07-autoxhr/29-xhrs-in-succession", function() {
 					assert.include(tf.beacons[2].u, "?2");
 					done();
 				}, 3);
-			});
+			},
+			this.skip.bind(this));
 	});
 });
diff --git a/tests/page-templates/07-autoxhr/30-ie1011-bug.html b/tests/page-templates/07-autoxhr/30-ie1011-bug.html
index f95b4a7d9..788404b5d 100644
--- a/tests/page-templates/07-autoxhr/30-ie1011-bug.html
+++ b/tests/page-templates/07-autoxhr/30-ie1011-bug.html
@@ -1,17 +1,22 @@
 <%= header %>
 <!--
-For this test case, we find that in IE 10 and IE 11, if you have a MutationObserver
+Boomerang no longer uses MutationObserver in IE 11
+
+Previously, we were testing for if you have a MutationObserver
 active in the document (whether its target is document or some other sub-element),
 with `subtree=true and `childList=true`, and a XMLHttpRequest is used to fetch
 UTF-8 XML content, the nodes in the XMLHttpRequest.responseXML might have
 additional newlines ('\n') added to them each time non-ASCII characters are encountered.
+
+Now, the test simply checks that if MutationObserver is enabled, that the XHR beacon will
+include the load time of the resources that are triggered when the XHR completes
 -->
 <script src="30-ie1011-bug.js" type="text/javascript"></script>
 <%= boomerangScript %>
 <script>
 BOOMR_test.init({
 	instrument_xhr: true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 2 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR) ? 2 : 1,
 	afterFirstBeacon:
 		function() {
 			if (!BOOMR.plugins.AutoXHR) {
@@ -28,8 +33,8 @@
 						// save the value of responseXML's first node for later
 						BOOMR_test.xhrValue = xhr.responseXML.documentElement.childNodes[0].nodeValue;
 
-						// create an IMG on the document to validate the MutationObserver is still
-						// working
+						// create an IMG on the document to validate that the XHR beacon will
+						// include the load time of the IMG if MutationObserver is enabled
 						BOOMR_test.img = document.createElement("img");
 						BOOMR_test.img.src = "/delay?file=/assets/img.jpg&delay=3000";
 						document.body.appendChild(BOOMR_test.img);
diff --git a/tests/page-templates/07-autoxhr/30-ie1011-bug.js b/tests/page-templates/07-autoxhr/30-ie1011-bug.js
index 206a88f91..706674c6c 100644
--- a/tests/page-templates/07-autoxhr/30-ie1011-bug.js
+++ b/tests/page-templates/07-autoxhr/30-ie1011-bug.js
@@ -11,7 +11,8 @@ describe("e2e/07-autoxhr/30-ie1011-bug", function() {
 			done,
 			function() {
 				t.ensureBeaconCount(done, 2);
-			});
+			},
+			this.skip.bind(this));
 	});
 
 	it("Should have the XHR beacon have the complete data", function(done) {
@@ -20,19 +21,38 @@ describe("e2e/07-autoxhr/30-ie1011-bug", function() {
 			function() {
 				assert.isTrue(t.xhrValue.indexOf("1340") !== -1, "XHR data is complete");
 				done();
-			});
+			},
+			this.skip.bind(this));
 	});
 
-	it("Should have waited for the IMG to load (if ResourceTiming is supported)", function(done) {
+	it("Should have waited for the IMG to load (if MutationObserver is supported)", function(done) {
 		t.ifAutoXHR(
 			done,
 			function() {
-				if (t.isResourceTimingSupported()) {
+				if (t.isMutationObserverSupported()) {
 					assert.operator(tf.beacons[1].t_done, ">=", 3000);
+					done();
 				}
+				else {
+					this.skip();
+				}
+			}.bind(this),
+			this.skip.bind(this));
+	});
 
-				done();
-			});
+	it("Should not have waited for the IMG to load (if MutationObserver is not supported)", function(done) {
+		t.ifAutoXHR(
+			done,
+			function() {
+				if (!t.isMutationObserverSupported()) {
+					assert.operator(tf.beacons[1].t_done, "<", 1000);
+					done();
+				}
+				else {
+					this.skip();
+				}
+			}.bind(this),
+			this.skip.bind(this));
 	});
 
 	it("Should have loaded right away (if ResourceTiming is not supported)", function(done) {
@@ -41,9 +61,12 @@ describe("e2e/07-autoxhr/30-ie1011-bug", function() {
 			function() {
 				if (!t.isResourceTimingSupported()) {
 					assert.operator(tf.beacons[1].t_done, ">=", 0);
+					done();
 				}
-
-				done();
-			});
+				else {
+					this.skip();
+				}
+			}.bind(this),
+			this.skip.bind(this));
 	});
 });
diff --git a/tests/page-templates/07-autoxhr/37-xhr-after-click.js b/tests/page-templates/07-autoxhr/37-xhr-after-click.js
index 835a6c676..c2a8a2cb0 100644
--- a/tests/page-templates/07-autoxhr/37-xhr-after-click.js
+++ b/tests/page-templates/07-autoxhr/37-xhr-after-click.js
@@ -15,7 +15,7 @@ describe("e2e/07-autoxhr/37-xhr-after-click", function() {
 	});
 
 	it("Should have a first beacon have the URL of the page", function(done){
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
+		if (t.isMutationObserverSupported()) {
 			t.ifAutoXHR(
 				done,
 				function() {
@@ -29,7 +29,7 @@ describe("e2e/07-autoxhr/37-xhr-after-click", function() {
 	});
 
 	it("Should have a second beacon with the XHR URL in it", function(done){
-		if (window.MutationObserver && typeof window.MutationObserver === "function") {
+		if (t.isMutationObserverSupported()) {
 			t.ifAutoXHR(
 				done,
 				function() {
diff --git a/tests/page-templates/11-restiming/03-url-length.js b/tests/page-templates/11-restiming/03-url-length.js
index a0de6751b..d3bbc83ce 100644
--- a/tests/page-templates/11-restiming/03-url-length.js
+++ b/tests/page-templates/11-restiming/03-url-length.js
@@ -26,7 +26,7 @@ describe("e2e/11-restiming/03-url-length", function() {
 			var resources = ResourceTimingDecompression.decompressResources(JSON.parse(b.restiming));
 
 			// find our img
-			assert.isDefined(resources.find(function(r) {
+			assert.isDefined(BOOMR.utils.arrayFind(resources, function(r) {
 				return r.name.indexOf("blackhole?...") !== -1;
 			}), "Find blackhole?...");
 		}
@@ -41,7 +41,7 @@ describe("e2e/11-restiming/03-url-length", function() {
 			var resources = ResourceTimingDecompression.decompressResources(JSON.parse(b.restiming));
 
 			// find our img
-			assert.isDefined(resources.find(function(r) {
+			assert.isDefined(BOOMR.utils.arrayFind(resources, function(r) {
 				return r.name.indexOf("/foo/...") !== -1;
 			}), "Find /foo/...");
 		}
diff --git a/tests/page-templates/11-restiming/05-no-beacon-url.html b/tests/page-templates/11-restiming/05-no-beacon-url.html
index e3506a131..9dcc549c0 100644
--- a/tests/page-templates/11-restiming/05-no-beacon-url.html
+++ b/tests/page-templates/11-restiming/05-no-beacon-url.html
@@ -4,7 +4,7 @@
 <script>
 BOOMR_test.init({
 	"instrument_xhr": true,
-	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && window.MutationObserver) ? 3 : 1,
+	testAfterOnBeacon: (BOOMR.plugins.AutoXHR && BOOMR_test.isMutationObserverSupported()) ? 3 : 1,
 	AutoXHR: {
 		alwaysSendXhr: true
 	},
diff --git a/tests/page-templates/11-restiming/06-iframes.js b/tests/page-templates/11-restiming/06-iframes.js
index 8620b491b..43ac4bf58 100644
--- a/tests/page-templates/11-restiming/06-iframes.js
+++ b/tests/page-templates/11-restiming/06-iframes.js
@@ -40,7 +40,7 @@ describe("e2e/11-restiming/06-iframes", function() {
 					continue;
 				}
 
-				assert.isDefined(resources.find(function(r) {
+				assert.isDefined(BOOMR.utils.arrayFind(resources, function(r) {
 					return r.name === url;
 				}), "Finding " + url);
 			}
@@ -56,7 +56,7 @@ describe("e2e/11-restiming/06-iframes", function() {
 
 			var resources = ResourceTimingDecompression.decompressResources(JSON.parse(b.restiming));
 
-			assert.isDefined(resources.find(function(r) {
+			assert.isDefined(BOOMR.utils.arrayFind(resources, function(r) {
 				return r.name.indexOf("/assets/img.jpg?iframe") !== -1;
 			}), "Finding /assets/img.jpg?iframe in the IFRAME");
 		}
diff --git a/tests/page-templates/11-restiming/07-script-attrs.js b/tests/page-templates/11-restiming/07-script-attrs.js
index 4991ec947..e91f4fed8 100644
--- a/tests/page-templates/11-restiming/07-script-attrs.js
+++ b/tests/page-templates/11-restiming/07-script-attrs.js
@@ -8,7 +8,7 @@ describe("e2e/11-restiming/07-script-attrs", function() {
 	function getInterestingScripts(resources) {
 		var interesting = [];
 		for (var i = 0; i < resources.length; i++) {
-			if (resources[i].name.endsWith("/mocha.js") || resources[i].name.match(/\/07-script-attrs(\.\w+)?\.js$/)) {
+			if (resources[i].name.indexOf("/mocha.js") !== -1 || resources[i].name.match(/\/07-script-attrs(\.\w+)?\.js$/)) {
 				interesting.push(resources[i]);
 			}
 		}
diff --git a/tests/page-templates/11-restiming/08-cross-origin.js b/tests/page-templates/11-restiming/08-cross-origin.js
index 14bb587a5..1dc82fb46 100644
--- a/tests/page-templates/11-restiming/08-cross-origin.js
+++ b/tests/page-templates/11-restiming/08-cross-origin.js
@@ -40,7 +40,12 @@ describe("e2e/11-restiming/06-iframes", function() {
 					continue;
 				}
 
-				assert.isDefined(resources.find(function(r) {
+				// skip about:blank (IE 11)
+				if (url.indexOf("about:blank") !== -1) {
+					continue;
+				}
+
+				assert.isDefined(BOOMR.utils.arrayFind(resources, function(r) {
 					return r.name === url;
 				}), "Finding " + url);
 			}
@@ -56,7 +61,7 @@ describe("e2e/11-restiming/06-iframes", function() {
 
 			var resources = ResourceTimingDecompression.decompressResources(JSON.parse(b.restiming));
 
-			assert.isDefined(resources.find(function(r) {
+			assert.isDefined(BOOMR.utils.arrayFind(resources, function(r) {
 				return r.name.indexOf("support/iframe.html?same-origin") !== -1;
 			}), "Finding support/iframe.html?same-origin");
 		}
@@ -71,7 +76,7 @@ describe("e2e/11-restiming/06-iframes", function() {
 
 			var resources = ResourceTimingDecompression.decompressResources(JSON.parse(b.restiming));
 
-			assert.isDefined(resources.find(function(r) {
+			assert.isDefined(BOOMR.utils.arrayFind(resources, function(r) {
 				return r.name.indexOf("/assets/img.jpg?iframe") !== -1;
 			}), "Finding /assets/img.jpg?iframe in the IFRAME");
 		}
@@ -86,7 +91,7 @@ describe("e2e/11-restiming/06-iframes", function() {
 
 			var resources = ResourceTimingDecompression.decompressResources(JSON.parse(b.restiming));
 
-			assert.isDefined(resources.find(function(r) {
+			assert.isDefined(BOOMR.utils.arrayFind(resources, function(r) {
 				return r.name.indexOf("support/iframe.html?cross-origin") !== -1;
 			}), "Finding support/iframe.html?cross-origin");
 		}
@@ -101,7 +106,7 @@ describe("e2e/11-restiming/06-iframes", function() {
 
 			var resources = ResourceTimingDecompression.decompressResources(JSON.parse(b.restiming));
 
-			assert.isUndefined(resources.find(function(r) {
+			assert.isUndefined(BOOMR.utils.arrayFind(resources, function(r) {
 				return r.name.indexOf("/assets/img.jpg?afteriframe") !== -1 &&
 				       r.name.indexOf(":" + window.crossOriginPort) !== -1;
 			}), "Not finding /assets/img.jpg?afteriframe from cross-origin iframe");
diff --git a/tests/page-templates/12-react/102-hard-nav-onload-xhr-after.js b/tests/page-templates/12-react/102-hard-nav-onload-xhr-after.js
index 4c0ef9ac7..e7ea72104 100644
--- a/tests/page-templates/12-react/102-hard-nav-onload-xhr-after.js
+++ b/tests/page-templates/12-react/102-hard-nav-onload-xhr-after.js
@@ -9,7 +9,7 @@ describe("e2e/12-react/102-hard-nav-onload-xhr-after", function() {
 			t.validateBeaconWasSent(done);
 		}
 		else {
-			done();
+			this.skip();
 		}
 	});
 
@@ -17,12 +17,18 @@ describe("e2e/12-react/102-hard-nav-onload-xhr-after", function() {
 		if (t.isMutationObserverSupported() && t.isNavigationTimingSupported()) {
 			assert.equal(tf.beacons.length, 1);
 		}
+		else {
+			this.skip();
+		}
 	});
 
 	it("Should have sent the first beacon as http.initiator = spa_hard", function() {
 		if (t.isMutationObserverSupported() && t.isNavigationTimingSupported()) {
 			assert.equal(tf.beacons[0]["http.initiator"], "spa_hard");
 		}
+		else {
+			this.skip();
+		}
 	});
 
 	it("Should have first beacon with a t_done of approximately NavTiming through the last IMG", function() {
@@ -30,5 +36,8 @@ describe("e2e/12-react/102-hard-nav-onload-xhr-after", function() {
 			var img = t.findFirstResource("img.jpg&id=xhr");
 			assert.closeTo(tf.beacons[0].t_done, img.responseEnd, 50);
 		}
+		else {
+			this.skip();
+		}
 	});
 });
diff --git a/tests/page-templates/12-react/103-hard-nav-onload-fired-no-xhr-boomr-delayed.js b/tests/page-templates/12-react/103-hard-nav-onload-fired-no-xhr-boomr-delayed.js
index 35794fe0f..48ea852c7 100644
--- a/tests/page-templates/12-react/103-hard-nav-onload-fired-no-xhr-boomr-delayed.js
+++ b/tests/page-templates/12-react/103-hard-nav-onload-fired-no-xhr-boomr-delayed.js
@@ -9,7 +9,7 @@ describe("e2e/12-react/103-hard-nav-onload-fired-no-xhr-boomr-delayed", function
 			t.validateBeaconWasSent(done);
 		}
 		else {
-			done();
+			this.skip();
 		}
 	});
 
@@ -17,12 +17,18 @@ describe("e2e/12-react/103-hard-nav-onload-fired-no-xhr-boomr-delayed", function
 		if (t.isMutationObserverSupported() && t.isNavigationTimingSupported()) {
 			assert.equal(tf.beacons.length, 1);
 		}
+		else {
+			this.skip();
+		}
 	});
 
 	it("Should have sent the first beacon as http.initiator = spa_hard", function() {
 		if (t.isMutationObserverSupported() && t.isNavigationTimingSupported()) {
 			assert.equal(tf.beacons[0]["http.initiator"], "spa_hard");
 		}
+		else {
+			this.skip();
+		}
 	});
 
 	it("Should have first beacon with a t_done of regular NavTiming Page Load time", function() {
@@ -32,6 +38,9 @@ describe("e2e/12-react/103-hard-nav-onload-fired-no-xhr-boomr-delayed", function
 			var pageLoad = (pt.loadEventStart - pt.navigationStart);
 			assert.closeTo(tf.beacons[0].t_done, pageLoad, 1);
 		}
+		else {
+			this.skip();
+		}
 	});
 });
 
diff --git a/tests/page-templates/12-react/104-hard-nav-onload-fired-xhr-after-load-boomr-delayed.js b/tests/page-templates/12-react/104-hard-nav-onload-fired-xhr-after-load-boomr-delayed.js
index f51e0e13d..a4b4e95a8 100644
--- a/tests/page-templates/12-react/104-hard-nav-onload-fired-xhr-after-load-boomr-delayed.js
+++ b/tests/page-templates/12-react/104-hard-nav-onload-fired-xhr-after-load-boomr-delayed.js
@@ -9,7 +9,7 @@ describe("e2e/12-react/104-hard-nav-onload-fired-xhr-after-load-boomr-delayed",
 			t.validateBeaconWasSent(done);
 		}
 		else {
-			done();
+			this.skip();
 		}
 	});
 
@@ -17,12 +17,18 @@ describe("e2e/12-react/104-hard-nav-onload-fired-xhr-after-load-boomr-delayed",
 		if (t.isMutationObserverSupported() && t.isNavigationTimingSupported()) {
 			assert.equal(tf.beacons.length, 1);
 		}
+		else {
+			this.skip();
+		}
 	});
 
 	it("Should have sent the first beacon as http.initiator = spa_hard", function() {
 		if (t.isMutationObserverSupported() && t.isNavigationTimingSupported()) {
 			assert.equal(tf.beacons[0]["http.initiator"], "spa_hard");
 		}
+		else {
+			this.skip();
+		}
 	});
 
 	it("Should have first beacon with a t_done of approximately NavTiming through the last IMG", function() {
@@ -30,5 +36,8 @@ describe("e2e/12-react/104-hard-nav-onload-fired-xhr-after-load-boomr-delayed",
 			var img = t.findFirstResource("img.jpg&id=xhr");
 			assert.closeTo(tf.beacons[0].t_done, img.responseEnd, 50);
 		}
+		else {
+			this.skip();
+		}
 	});
 });
diff --git a/tests/page-templates/12-react/106-mo-disabled-before-nav.js b/tests/page-templates/12-react/106-mo-disabled-before-nav.js
index f5d2ad985..9616140ea 100644
--- a/tests/page-templates/12-react/106-mo-disabled-before-nav.js
+++ b/tests/page-templates/12-react/106-mo-disabled-before-nav.js
@@ -12,6 +12,9 @@ describe("e2e/12-react/106-mo-disabled-before-nav", function() {
 		if (t.isMutationObserverSupported()) {
 			assert.isDefined(BOOMR.proxy_XMLHttpRequest);
 		}
+		else {
+			this.skip();
+		}
 	});
 
 });
diff --git a/tests/page-templates/14-errors/29-boomr-errors-plugin-disabled.js b/tests/page-templates/14-errors/29-boomr-errors-plugin-disabled.js
index f17e359dc..3ec09a227 100644
--- a/tests/page-templates/14-errors/29-boomr-errors-plugin-disabled.js
+++ b/tests/page-templates/14-errors/29-boomr-errors-plugin-disabled.js
@@ -28,7 +28,7 @@ describe("e2e/14-errors/29-boomr-errors-plugin-disabled", function() {
 	it("Should have error #1 match expected", function() {
 		var b = tf.lastBeacon();
 		var err = b.errors.split("\n")[0];
-		assert.match(err, /^\[BOOMRtest:\d{13}\] ReferenceError: (?:'?a'? is not defined|Can't find variable: a)$/);
+		assert.match(err, /^\[BOOMRtest:\d{13}\] ReferenceError: (?:'?a'? is not defined|Can't find variable: a|'?a'? is undefined)$/);
 	});
 
 	it("Should have error #2 match expected", function() {
diff --git a/tests/test-templates/spa/00-simple.js b/tests/test-templates/spa/00-simple.js
index 71e0136b4..95e83b1a3 100644
--- a/tests/test-templates/spa/00-simple.js
+++ b/tests/test-templates/spa/00-simple.js
@@ -15,7 +15,7 @@ BOOMR_test.templates.SPA["00-simple"] = function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "img.jpg", 100, 3000, 30000, true);
 		}
 		else {
@@ -24,7 +24,7 @@ BOOMR_test.templates.SPA["00-simple"] = function() {
 	});
 
 	it("Should have a t_resp of the root page (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.lastBeacon();
 			assert.equal(b.t_resp, pt.responseStart - pt.navigationStart);
@@ -35,7 +35,7 @@ BOOMR_test.templates.SPA["00-simple"] = function() {
 	});
 
 	it("Should have a t_page of total - t_resp (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var pt = window.performance.timing;
 			var b = tf.lastBeacon();
 			assert.equal(b.t_page, b.t_done - b.t_resp);
@@ -46,7 +46,7 @@ BOOMR_test.templates.SPA["00-simple"] = function() {
 	});
 
 	it("Should not have a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.lastBeacon();
 			assert.equal(b.t_done, undefined);
 		}
@@ -56,7 +56,8 @@ BOOMR_test.templates.SPA["00-simple"] = function() {
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+			// this fails in react, onload happens later than the XHR
 			t.validateBeaconWasSentAfter(0, "widgets.json", 100, 0, 30000, true);
 		}
 		else {
@@ -65,7 +66,7 @@ BOOMR_test.templates.SPA["00-simple"] = function() {
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.lastBeacon();
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -81,7 +82,7 @@ BOOMR_test.templates.SPA["00-simple"] = function() {
 	});
 
 	it("Should have NavigationTiming metrics (if MutationObserver and NavigationTiming are supported)", function() {
-		if (typeof window.MutationObserver !== "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.lastBeacon();
 			assert.equal(b.nt_red_cnt, 0);  // no redirects
 			assert.isDefined(b.nt_nav_type);
diff --git a/tests/test-templates/spa/04-route-change.js b/tests/test-templates/spa/04-route-change.js
index 949f57f37..33e2c5436 100644
--- a/tests/test-templates/spa/04-route-change.js
+++ b/tests/test-templates/spa/04-route-change.js
@@ -60,7 +60,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "img.jpg&id=home", 500, 3000, 30000, 0);
 		}
 		else {
@@ -69,7 +69,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should not have a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 		}
@@ -79,7 +79,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 500, 0, 30000, false);
 		}
 		else {
@@ -88,7 +88,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -99,7 +99,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should have a t_resp of the root page (if MutationObserver and ResourceTiming are supported)", function() {
-		if (window.MutationObserver && t.isResourceTimingSupported()) {
+		if (t.isMutationObserverSupported() && t.isResourceTimingSupported()) {
 			var pt = window.performance.timing;
 			var b = tf.beacons[0];
 			assert.equal(b.t_resp, pt.responseStart - pt.navigationStart);
@@ -110,7 +110,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should have a t_page of total - t_resp (if MutationObserver and ResourceTiming are supported)", function() {
-		if (window.MutationObserver && t.isResourceTimingSupported()) {
+		if (t.isMutationObserverSupported() && t.isResourceTimingSupported()) {
 			var b = tf.beacons[0];
 			assert.equal(b.t_page, b.t_done - b.t_resp);
 		}
@@ -128,7 +128,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 second (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 1000);
@@ -139,7 +139,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second but we couldn't track it because no MO support
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 0);
@@ -150,7 +150,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should have sent the second beacon with a t_resp value (if MutationObserver and ResourceTiming are supported)", function() {
-		if (window.MutationObserver && t.isResourceTimingSupported()) {
+		if (t.isMutationObserverSupported() && t.isResourceTimingSupported()) {
 			var b = tf.beacons[1];
 
 			assert.operator(b.t_resp, ">=", 0);
@@ -161,7 +161,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should have sent the second beacon with a t_page of total - t_resp (if MutationObserver and ResourceTiming are supported)", function() {
-		if (window.MutationObserver && t.isResourceTimingSupported()) {
+		if (t.isMutationObserverSupported() && t.isResourceTimingSupported()) {
 			var b = tf.beacons[1];
 			assert.equal(b.t_page, b.t_done - b.t_resp);
 		}
@@ -179,7 +179,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should have sent the third with a timestamp of at least 3 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, ">=", 3000);
 		}
@@ -189,7 +189,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should have sent the third with a timestamp of under 1 second (if MutationObserver is not supported)", function() {
-		if (!window.MutationObserver) {
+		if (!t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, "<=", 1000);
 		}
@@ -199,7 +199,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should have sent the third beacon with a t_resp value (if MutationObserver and ResourceTiming are supported)", function() {
-		if (window.MutationObserver && t.isResourceTimingSupported()) {
+		if (t.isMutationObserverSupported() && t.isResourceTimingSupported()) {
 			var b = tf.beacons[2];
 
 			assert.operator(b.t_resp, ">=", 0);
@@ -210,7 +210,7 @@ BOOMR_test.templates.SPA["04-route-change"] = function() {
 	});
 
 	it("Should have sent the third beacon with a t_page of total - t_resp (if MutationObserver and ResourceTiming are supported)", function() {
-		if (window.MutationObserver && t.isResourceTimingSupported()) {
+		if (t.isMutationObserverSupported() && t.isResourceTimingSupported()) {
 			var b = tf.beacons[2];
 			assert.equal(b.t_page, b.t_done - b.t_resp);
 		}
diff --git a/tests/test-templates/spa/05-route-change-hashtags.js b/tests/test-templates/spa/05-route-change-hashtags.js
index ce3eb2f8c..a9bfe7241 100644
--- a/tests/test-templates/spa/05-route-change-hashtags.js
+++ b/tests/test-templates/spa/05-route-change-hashtags.js
@@ -43,7 +43,7 @@ BOOMR_test.templates.SPA["05-route-change-hashtags"] = function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "img.jpg&id=home", 500, 3000, 30000, 0);
 		}
 		else {
@@ -52,7 +52,7 @@ BOOMR_test.templates.SPA["05-route-change-hashtags"] = function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 		}
@@ -62,7 +62,7 @@ BOOMR_test.templates.SPA["05-route-change-hashtags"] = function() {
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 500, 0, 30000, false);
 		}
 		else {
@@ -71,7 +71,7 @@ BOOMR_test.templates.SPA["05-route-change-hashtags"] = function() {
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -91,7 +91,7 @@ BOOMR_test.templates.SPA["05-route-change-hashtags"] = function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 second (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 1000);
@@ -102,7 +102,7 @@ BOOMR_test.templates.SPA["05-route-change-hashtags"] = function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second but we couldn't track it because no MO support
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 0);
@@ -122,7 +122,7 @@ BOOMR_test.templates.SPA["05-route-change-hashtags"] = function() {
 	});
 
 	it("Should have sent the third with a timestamp of at least 3 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, ">=", 3000);
 		}
@@ -132,7 +132,7 @@ BOOMR_test.templates.SPA["05-route-change-hashtags"] = function() {
 	});
 
 	it("Should have sent the third with a timestamp of under 1 second (if MutationObserver is not supported)", function() {
-		if (!window.MutationObserver) {
+		if (!t.isMutationObserverSupported()) {
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, "<=", 1000);
 		}
diff --git a/tests/test-templates/spa/06-hard-nav-resources.js b/tests/test-templates/spa/06-hard-nav-resources.js
index 3b0657a7f..804a2ba97 100644
--- a/tests/test-templates/spa/06-hard-nav-resources.js
+++ b/tests/test-templates/spa/06-hard-nav-resources.js
@@ -15,7 +15,7 @@ BOOMR_test.templates.SPA["06-hard-nav-resources"] = function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver and NavigationTiming is supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "delay=5000", 100, 3000, 30000, true);
 		}
 		else {
@@ -24,7 +24,7 @@ BOOMR_test.templates.SPA["06-hard-nav-resources"] = function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 		}
@@ -34,7 +34,7 @@ BOOMR_test.templates.SPA["06-hard-nav-resources"] = function() {
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 100, 0, 30000, true);
 		}
 		else {
@@ -43,7 +43,7 @@ BOOMR_test.templates.SPA["06-hard-nav-resources"] = function() {
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
diff --git a/tests/test-templates/spa/07-soft-nav-resources.js b/tests/test-templates/spa/07-soft-nav-resources.js
index ce2f36696..15cc555a6 100644
--- a/tests/test-templates/spa/07-soft-nav-resources.js
+++ b/tests/test-templates/spa/07-soft-nav-resources.js
@@ -43,7 +43,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Should have the first beacon take as long as the first img load (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "img.jpg&id=home", 500, 3000, 30000);
 		}
 		else {
@@ -52,7 +52,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Should have the first beacon take as long as the first img load (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 		}
@@ -62,7 +62,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Should have the first beacon take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 500, 0, 30000, false);
 		}
 		else {
@@ -71,7 +71,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Shouldn't have the first beacon have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -90,7 +90,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 1000);
@@ -101,7 +101,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second but we couldn't track it because no MO support
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 0);
@@ -126,7 +126,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Should have sent the third beacon with a timestamp of at least 2 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 2 second
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, ">=", 2000);
@@ -137,7 +137,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Should have sent the third beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 2 seconds but we couldn't track it because no MO support
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, ">=", 0);
@@ -159,7 +159,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Should have sent the fourth beacon with a timestamp of at least 3 seconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 3 second
 			var b = tf.beacons[3];
 			assert.operator(b.t_done, ">=", 3000);
@@ -170,7 +170,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Should have sent the fourth beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 3 seconds but we couldn't track it because no MO support
 			var b = tf.beacons[3];
 			assert.operator(b.t_done, ">=", 0);
@@ -201,7 +201,7 @@ BOOMR_test.templates.SPA["07-soft-nav-resources"] = function() {
 	});
 
 	it("Should have sent the fifth beacon without any NavigationTiming metrics (if MutationObserver and NavigationTiming are supported)", function() {
-		if (typeof window.MutationObserver !== "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.lastBeacon();
 			assert.isUndefined(b.nt_red_cnt);
 			assert.isUndefined(b.nt_nav_type);
diff --git a/tests/test-templates/spa/11-autoxhr-trigger-additional.js b/tests/test-templates/spa/11-autoxhr-trigger-additional.js
index 4e9c266c2..d8de89e3f 100644
--- a/tests/test-templates/spa/11-autoxhr-trigger-additional.js
+++ b/tests/test-templates/spa/11-autoxhr-trigger-additional.js
@@ -67,7 +67,7 @@ BOOMR_test.templates.SPA["11-autoxhr-trigger-additional"] = function() {
 		t.ifAutoXHR(
 			done,
 			function() {
-				if (window.MutationObserver) {
+				if (t.isMutationObserverSupported()) {
 					assert.closeTo(tf.beacons[1].t_done, 4000, 500);
 				}
 				done();
@@ -78,7 +78,7 @@ BOOMR_test.templates.SPA["11-autoxhr-trigger-additional"] = function() {
 		t.ifAutoXHR(
 			done,
 			function() {
-				if (typeof window.MutationObserver === "undefined") {
+				if (!t.isMutationObserverSupported()) {
 					assert.closeTo(tf.beacons[1].t_done, 2000, 500);
 				}
 				done();
diff --git a/tests/test-templates/spa/12-autoxhr-trigger-additional-after-delay.js b/tests/test-templates/spa/12-autoxhr-trigger-additional-after-delay.js
index 5fc43ecb9..2a87f40a2 100644
--- a/tests/test-templates/spa/12-autoxhr-trigger-additional-after-delay.js
+++ b/tests/test-templates/spa/12-autoxhr-trigger-additional-after-delay.js
@@ -67,7 +67,7 @@ BOOMR_test.templates.SPA["12-autoxhr-trigger-additional-after-delay"] = function
 		t.ifAutoXHR(
 			done,
 			function() {
-				if (window.MutationObserver) {
+				if (t.isMutationObserverSupported()) {
 					assert.closeTo(tf.beacons[1].t_done, 4000, 500);
 				}
 				done();
@@ -78,7 +78,7 @@ BOOMR_test.templates.SPA["12-autoxhr-trigger-additional-after-delay"] = function
 		t.ifAutoXHR(
 			done,
 			function() {
-				if (typeof window.MutationObserver === "undefined") {
+				if (!t.isMutationObserverSupported()) {
 					assert.closeTo(tf.beacons[1].t_done, 2000, 500);
 				}
 				done();
diff --git a/tests/test-templates/spa/14-autoxhr-before-page-load.js b/tests/test-templates/spa/14-autoxhr-before-page-load.js
index ea5d6b55f..0e9c292d6 100644
--- a/tests/test-templates/spa/14-autoxhr-before-page-load.js
+++ b/tests/test-templates/spa/14-autoxhr-before-page-load.js
@@ -15,7 +15,7 @@ BOOMR_test.templates.SPA["14-autoxhr-before-page-load"] = function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "img.jpg", 100, 3000, 30000, true);
 		}
 		else {
@@ -24,7 +24,7 @@ BOOMR_test.templates.SPA["14-autoxhr-before-page-load"] = function() {
 	});
 
 	it("Should not have a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.lastBeacon();
 			assert.equal(b.t_done, undefined);
 		}
@@ -34,7 +34,7 @@ BOOMR_test.templates.SPA["14-autoxhr-before-page-load"] = function() {
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 100, 0, 30000, true);
 		}
 		else {
@@ -43,7 +43,7 @@ BOOMR_test.templates.SPA["14-autoxhr-before-page-load"] = function() {
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.lastBeacon();
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
diff --git a/tests/test-templates/spa/17-wait.js b/tests/test-templates/spa/17-wait.js
index 37bc87b1f..c521e4a3a 100644
--- a/tests/test-templates/spa/17-wait.js
+++ b/tests/test-templates/spa/17-wait.js
@@ -35,7 +35,7 @@ BOOMR_test.templates.SPA["17-wait"] = function() {
 		t.ifAutoXHR(
 			done,
 			function() {
-				if (window.MutationObserver) {
+				if (t.isMutationObserverSupported()) {
 					assert.operator(tf.beacons[0].t_done, ">=", 5000);
 				}
 				done();
@@ -86,7 +86,7 @@ BOOMR_test.templates.SPA["17-wait"] = function() {
 	});
 
 	it("Should have sent the third beacon with a timestamp of at least 1 second (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, ">=", 1000);
@@ -97,7 +97,7 @@ BOOMR_test.templates.SPA["17-wait"] = function() {
 	});
 
 	it("Should have sent the third beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second but we couldn't track it because no MO support
 			var b = tf.beacons[2];
 			assert.operator(b.t_done, ">=", 0);
@@ -111,7 +111,7 @@ BOOMR_test.templates.SPA["17-wait"] = function() {
 		t.ifAutoXHR(
 			done,
 			function() {
-				if (window.MutationObserver) {
+				if (t.isMutationObserverSupported()) {
 					assert.operator(tf.beacons[2]["rt.end"], ">=", window.spaWaitCompleteTimes[2] + 10);
 				}
 				done();
diff --git a/tests/test-templates/spa/19-autoxhr-during-nav-alwayssendxhr.js b/tests/test-templates/spa/19-autoxhr-during-nav-alwayssendxhr.js
index 956b91d7a..8f8ea059a 100644
--- a/tests/test-templates/spa/19-autoxhr-during-nav-alwayssendxhr.js
+++ b/tests/test-templates/spa/19-autoxhr-during-nav-alwayssendxhr.js
@@ -64,7 +64,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have sent " + BEACONS_SENT + " beacons (AutoXHR is enabled and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			assert.equal(tf.beacons.length, BEACONS_SENT);
 		}
 		else {
@@ -73,7 +73,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have sent " + BEACONS_SENT_SPA + " spa beacons (AutoXHR is enabled and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			assert.equal(getBeaconByType().spa.length, BEACONS_SENT_SPA);
 		}
 		else {
@@ -82,7 +82,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have sent " + BEACONS_SENT_SPA_HARD + " spa_hard beacons (AutoXHR is enabled and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			assert.equal(getBeaconByType().spa_hard.length, BEACONS_SENT_SPA_HARD);
 		}
 		else {
@@ -91,7 +91,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have sent " + BEACONS_SENT_XHR + " xhr beacons (AutoXHR is enabled and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			assert.equal(getBeaconByType().xhr.length, BEACONS_SENT_XHR);
 		}
 		else {
@@ -112,7 +112,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	// XHR beacons
 	//
 	it("Should have set http.initiator = 'xhr' on the XHR beacons (if AutoXHR is enabled and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			var beacons = getBeaconByType();
 			for (var k in beacons.xhr) {
 				if (beacons.xhr.hasOwnProperty(k)) {
@@ -126,7 +126,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have set rt.start = 'manual' on the XHR beacons (if AutoXHR is enabled and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			var beacons = getBeaconByType();
 			for (var k in beacons.xhr) {
 				if (beacons.xhr.hasOwnProperty(k)) {
@@ -140,7 +140,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have set beacon's nt_* timestamps accurately (if AutoXHR is enabled and NavigationTiming is supported and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && t.isNavigationTimingSupported() && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isNavigationTimingSupported() && t.isMutationObserverSupported()) {
 			var beacons = getBeaconByType();
 			for (var k in beacons.xhr) {
 				if (beacons.xhr.hasOwnProperty(k)) {
@@ -168,7 +168,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have set pgu = the page's location on the XHR beacons (if AutoXHR is enabled and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			var beacons = getBeaconByType();
 			for (var k in beacons.xhr) {
 				if (beacons.xhr.hasOwnProperty(k)) {
@@ -182,7 +182,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have set nt_load_end==nt_load_st==rt.end on the XHR beacons (if AutoXHR is enabled and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			var beacons = getBeaconByType();
 			for (var k in beacons.xhr) {
 				if (beacons.xhr.hasOwnProperty(k)) {
@@ -199,7 +199,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have set t_done = rt.end - nt_fet_st for the XHR beacons (if AutoXHR is enabled and NavigationTiming is supported and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && t.isNavigationTimingSupported() && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isNavigationTimingSupported() && t.isMutationObserverSupported()) {
 			var beacons = getBeaconByType();
 			for (var k in beacons.xhr) {
 				if (beacons.xhr.hasOwnProperty(k)) {
@@ -214,7 +214,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have set t_resp = nt_res_end - nt_fet_st for the XHR beacons (if AutoXHR is enabled and NavigationTiming is supported and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && t.isNavigationTimingSupported() && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isNavigationTimingSupported() && t.isMutationObserverSupported()) {
 			var beacons = getBeaconByType();
 			for (var k in beacons.xhr) {
 				if (beacons.xhr.hasOwnProperty(k)) {
@@ -229,7 +229,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	});
 
 	it("Should have set t_page = t_done - t_resp for the XHR beacons (if AutoXHR is enabled and MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			var beacons = getBeaconByType();
 			for (var k in beacons.xhr) {
 				if (beacons.xhr.hasOwnProperty(k)) {
@@ -247,7 +247,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	// Test all Hard Beacons
 	//
 	it("Should have set http.initiator = 'spa_hard' on the first SPA beacon (if MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			var beacons = getBeaconByType();
 			for (var k in beacons.spa_hard) {
 				if (beacons.spa_hard.hasOwnProperty(k)) {
@@ -265,7 +265,7 @@ BOOMR_test.templates.SPA["19-autoxhr-during-nav-alwayssendxhr"] = function() {
 	// Test all Soft Beacons
 	//
 	it("Should have set http.initiator = 'spa' on the next SPA beacons (if MutationObserver is supported)", function() {
-		if (BOOMR.plugins.AutoXHR && window.MutationObserver) {
+		if (BOOMR.plugins.AutoXHR && t.isMutationObserverSupported()) {
 			var beacons = getBeaconByType();
 			for (var k in beacons.spa) {
 				if (beacons.spa.hasOwnProperty(k)) {
diff --git a/tests/test-templates/spa/20-no-resources.js b/tests/test-templates/spa/20-no-resources.js
index ec8619e56..e1461725b 100644
--- a/tests/test-templates/spa/20-no-resources.js
+++ b/tests/test-templates/spa/20-no-resources.js
@@ -40,7 +40,7 @@ BOOMR_test.templates.SPA["20-no-resources"] = function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of less than 100 milliseconds (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, "<=", 100);
 		}
@@ -50,7 +50,7 @@ BOOMR_test.templates.SPA["20-no-resources"] = function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 0);
 		}
diff --git a/tests/test-templates/spa/23-hard-wait-for-onload.js b/tests/test-templates/spa/23-hard-wait-for-onload.js
index 5ef49192b..afb24444f 100644
--- a/tests/test-templates/spa/23-hard-wait-for-onload.js
+++ b/tests/test-templates/spa/23-hard-wait-for-onload.js
@@ -3,6 +3,7 @@
 BOOMR_test.templates.SPA = BOOMR_test.templates.SPA || {};
 BOOMR_test.templates.SPA["23-hard-wait-for-onload"] = function() {
 	var tf = BOOMR.plugins.TestFramework;
+	var t = BOOMR_test;
 
 	it("Should have only sent one beacon", function() {
 		// only one beacon should've been sent
@@ -10,7 +11,7 @@ BOOMR_test.templates.SPA["23-hard-wait-for-onload"] = function() {
 	});
 
 	it("Should have been a spa_hard beacon (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			assert.equal(tf.beacons[0]["http.initiator"], "spa_hard");
 		}
 		else {
@@ -19,7 +20,7 @@ BOOMR_test.templates.SPA["23-hard-wait-for-onload"] = function() {
 	});
 
 	it("Should have fired after onload (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			var b = tf.beacons[0];
 
 			assert.notEqual(b.nt_load_st, 0, "performance.timing.loadEventStart should not be 0");
diff --git a/tests/test-templates/spa/24-route-filter.js b/tests/test-templates/spa/24-route-filter.js
index 5262b5368..ec221522d 100644
--- a/tests/test-templates/spa/24-route-filter.js
+++ b/tests/test-templates/spa/24-route-filter.js
@@ -39,7 +39,7 @@ BOOMR_test.templates.SPA["24-route-filter"] = function() {
 	});
 
 	it("Should take as long as the longest img load (if MutationObserver and NavigationTiming are supported)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "img.jpg&id=home", 500, 3000, 30000, 0);
 		}
 		else {
@@ -48,7 +48,7 @@ BOOMR_test.templates.SPA["24-route-filter"] = function() {
 	});
 
 	it("Should not have a load time (if MutationObserver is supported but NavigationTiming is not)", function() {
-		if (window.MutationObserver && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 		}
@@ -58,7 +58,7 @@ BOOMR_test.templates.SPA["24-route-filter"] = function() {
 	});
 
 	it("Should take as long as the XHRs (if MutationObserver is not supported but NavigationTiming is)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() !== "undefined") {
 			t.validateBeaconWasSentAfter(0, "widgets.json", 500, 0, 30000, false);
 		}
 		else {
@@ -67,7 +67,7 @@ BOOMR_test.templates.SPA["24-route-filter"] = function() {
 	});
 
 	it("Shouldn't have a load time (if MutationObserver and NavigationTiming are not supported)", function() {
-		if (typeof window.MutationObserver === "undefined" && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
+		if (!t.isMutationObserverSupported() && typeof BOOMR.plugins.RT.navigationStart() === "undefined") {
 			var b = tf.beacons[0];
 			assert.equal(b.t_done, undefined);
 			assert.equal(b["rt.start"], "none");
@@ -86,7 +86,7 @@ BOOMR_test.templates.SPA["24-route-filter"] = function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 second (if MutationObserver is supported)", function() {
-		if (window.MutationObserver) {
+		if (t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 1000);
@@ -97,7 +97,7 @@ BOOMR_test.templates.SPA["24-route-filter"] = function() {
 	});
 
 	it("Should have sent the second beacon with a timestamp of at least 1 millisecond (if MutationObserver is not supported)", function() {
-		if (typeof window.MutationObserver === "undefined") {
+		if (!t.isMutationObserverSupported()) {
 			// because of the widget IMG delaying 1 second but we couldn't track it because no MO support
 			var b = tf.beacons[1];
 			assert.operator(b.t_done, ">=", 0);