diff --git a/browser/base/content/test/performance/browser.ini b/browser/base/content/test/performance/browser.ini
index 8c49c31a6e8d..d425ff398260 100644
--- a/browser/base/content/test/performance/browser.ini
+++ b/browser/base/content/test/performance/browser.ini
@@ -10,6 +10,9 @@ prefs =
   browser.migration.version=9999999
   browser.startup.record=true
   gfx.canvas.willReadFrequently.enable=true
+  # The form autofill framescript is only used in certain locales if this
+  # pref is set to 'detect', which is the default value on non-Nightly.
+  extensions.formautofill.available='on'
 support-files =
   head.js
 [browser_appmenu.js]
diff --git a/browser/base/content/test/performance/browser_startup_content.js b/browser/base/content/test/performance/browser_startup_content.js
index 8a451abcc495..042e542dc650 100644
--- a/browser/base/content/test/performance/browser_startup_content.js
+++ b/browser/base/content/test/performance/browser_startup_content.js
@@ -1,8 +1,8 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
-/* This test records which services, JS components, process scripts, and JS
- * modules are loaded when creating a new content process.
+/* This test records which services, JS components, frame scripts, process
+ * scripts, and JS modules are loaded when creating a new content process.
  *
  * If you made changes that cause this test to fail, it's likely because you
  * are loading more JS code during content process startup.
@@ -68,6 +68,23 @@ const whitelist = {
     "resource://gre/modules/ExtensionUtils.jsm",
     "resource://gre/modules/MessageChannel.jsm",
   ]),
+  frameScripts: new Set([
+    // Test related
+    "resource://specialpowers/MozillaLogger.js",
+    "resource://specialpowers/specialpowersFrameScript.js",
+    "chrome://mochikit/content/shutdown-leaks-collector.js",
+    "chrome://mochikit/content/tests/SimpleTest/AsyncUtilsContent.js",
+    "chrome://mochikit/content/tests/BrowserTestUtils/content-utils.js",
+
+    // Browser front-end
+    "chrome://global/content/browser-content.js",
+
+    // Forms
+    "chrome://formautofill/content/FormAutofillFrameScript.js",
+
+    // Extensions
+    "resource://gre/modules/addons/Content.js",
+  ]),
   processScripts: new Set([
     "chrome://global/content/process-content.js",
     "resource:///modules/ContentObservers.js",
@@ -89,6 +106,7 @@ const intermittently_loaded_whitelist = {
   modules: new Set([
     "resource://gre/modules/sessionstore/Utils.jsm",
   ]),
+  frameScripts: new Set([]),
   processScripts: new Set([]),
 };
 
@@ -140,6 +158,12 @@ add_task(async function() {
 
   let loadedInfo = await promise;
 
+  // Gather loaded frame scripts.
+  loadedInfo.frameScripts = {};
+  for (let [uri] of Services.mm.getDelayedFrameScripts()) {
+    loadedInfo.frameScripts[uri] = "";
+  }
+
   // Gather loaded process scripts.
   loadedInfo.processScripts = {};
   for (let [uri] of Services.ppmm.getDelayedProcessScripts()) {