diff --git a/api/PerformanceEntry.json b/api/PerformanceEntry.json
index dfc330e3f4ef05..c20a652215f842 100644
--- a/api/PerformanceEntry.json
+++ b/api/PerformanceEntry.json
@@ -27,10 +27,10 @@
             "version_added": "12"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "35"
           },
           "firefox_android": {
-            "version_added": "25"
+            "version_added": "35"
           },
           "ie": {
             "version_added": "10"
@@ -103,10 +103,10 @@
               "version_added": "12"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "35"
             },
             "firefox_android": {
-              "version_added": "25"
+              "version_added": "35"
             },
             "ie": {
               "version_added": "10"
@@ -155,10 +155,10 @@
               "version_added": "12"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "35"
             },
             "firefox_android": {
-              "version_added": "25"
+              "version_added": "35"
             },
             "ie": {
               "version_added": "10"
@@ -207,10 +207,10 @@
               "version_added": "12"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "35"
             },
             "firefox_android": {
-              "version_added": "25"
+              "version_added": "35"
             },
             "ie": {
               "version_added": "10"
@@ -259,10 +259,10 @@
               "version_added": "12"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "35"
             },
             "firefox_android": {
-              "version_added": "25"
+              "version_added": "35"
             },
             "ie": {
               "version_added": "10"
@@ -311,10 +311,10 @@
               "version_added": "16"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "35"
             },
             "firefox_android": {
-              "version_added": "25"
+              "version_added": "35"
             },
             "ie": {
               "version_added": false