diff --git a/.eslintrc b/.eslintrc
index 77433e7c99ad0..e942b58f34626 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -45,7 +45,6 @@
       "ignore": ["display", "pdfjs", "pdfjs-lib", "pdfjs-web", "web", "fluent-bundle", "fluent-dom"],
     }],
     "mozilla/avoid-removeChild": "error",
-    "mozilla/use-includes-instead-of-indexOf": "error",
     "no-unsanitized/method": "error",
     "no-unsanitized/property": "error",
     "sort-exports/sort-exports": ["error", {
@@ -70,6 +69,7 @@
     "unicorn/prefer-date-now": "error",
     "unicorn/prefer-dom-node-append": "error",
     "unicorn/prefer-dom-node-remove": "error",
+    "unicorn/prefer-includes": "error",
     "unicorn/prefer-logical-operator-over-ternary": "error",
     "unicorn/prefer-modern-dom-apis": "error",
     "unicorn/prefer-modern-math-apis": "error",
@@ -79,6 +79,7 @@
     "unicorn/prefer-string-replace-all": "error",
     "unicorn/prefer-string-starts-ends-with": "error",
     "unicorn/prefer-ternary": ["error", "only-single-line"],
+    "unicorn/throw-new-error": "error",
 
     // Possible errors
     "for-direction": "error",
diff --git a/test/driver.js b/test/driver.js
index 362c3d33d6ba0..c79c30601380e 100644
--- a/test/driver.js
+++ b/test/driver.js
@@ -1075,7 +1075,7 @@ class Driver {
       this.output.textContent += message;
     }
 
-    if (message.lastIndexOf("\n") >= 0 && !this.disableScrolling.checked) {
+    if (message.includes("\n") && !this.disableScrolling.checked) {
       // Scroll to the bottom of the page
       this.output.scrollTop = this.output.scrollHeight;
     }