diff --git a/devtools/client/webide/test/head.js b/devtools/client/webide/test/head.js
index b4497d42c0b5..b8b1793486d7 100644
--- a/devtools/client/webide/test/head.js
+++ b/devtools/client/webide/test/head.js
@@ -4,6 +4,7 @@
 "use strict";
 
 const { require } = ChromeUtils.import("resource://devtools/shared/Loader.jsm", {});
+ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
 const { FileUtils } = require("resource://gre/modules/FileUtils.jsm");
 const { gDevTools } = require("devtools/client/framework/devtools");
 const Services = require("Services");
@@ -12,7 +13,7 @@ const DevToolsUtils = require("devtools/shared/DevToolsUtils");
 const { DebuggerServer } = require("devtools/server/main");
 
 var TEST_BASE;
-if (window.location === "chrome://browser/content/browser.xul") {
+if (window.location === AppConstants.BROWSER_CHROME_URL) {
   TEST_BASE = "chrome://mochitests/content/browser/devtools/client/webide/test/";
 } else {
   TEST_BASE = "chrome://mochitests/content/chrome/devtools/client/webide/test/";
diff --git a/dom/base/test/test_openDialogChromeOnly.html b/dom/base/test/test_openDialogChromeOnly.html
index 6548668c0c60..810e21295e19 100644
--- a/dom/base/test/test_openDialogChromeOnly.html
+++ b/dom/base/test/test_openDialogChromeOnly.html
@@ -13,7 +13,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=931768
   /** Test for Bug 931768 **/
 
   try {
-    openDialog("chrome://browser/content/browser.xul");
+    openDialog(AppConstants.BROWSER_CHROME_URL);
     ok(false, "Calling openDialog from unprivileged script should throw.");
   } catch (e) {
     ok(e instanceof ReferenceError,
diff --git a/testing/mochitest/BrowserTestUtils/BrowserTestUtils.jsm b/testing/mochitest/BrowserTestUtils/BrowserTestUtils.jsm
index 67171e25d226..ab21bdfb6fbe 100644
--- a/testing/mochitest/BrowserTestUtils/BrowserTestUtils.jsm
+++ b/testing/mochitest/BrowserTestUtils/BrowserTestUtils.jsm
@@ -577,7 +577,7 @@ var BrowserTestUtils = {
         if (url) {
           await this.waitForEvent(win, "DOMContentLoaded");
 
-          if (win.document.documentURI != "chrome://browser/content/browser.xul") {
+          if (win.document.documentURI != AppConstants.BROWSER_CHROME_URL) {
             return;
           }
         }
diff --git a/testing/mochitest/api.js b/testing/mochitest/api.js
index c80e9b31d166..2cdcb42a22d4 100644
--- a/testing/mochitest/api.js
+++ b/testing/mochitest/api.js
@@ -32,7 +32,7 @@ const windowTracker = {
       let {document} = window;
       let {documentURI} = document;
 
-      if (documentURI !== "chrome://browser/content/browser.xul") {
+      if (documentURI !== AppConstants.BROWSER_CHROME_URL) {
         return;
       }
       loadChromeScripts(window);
diff --git a/testing/mochitest/browser-test.js b/testing/mochitest/browser-test.js
index 5cac16180d7b..1b296fd6e14d 100644
--- a/testing/mochitest/browser-test.js
+++ b/testing/mochitest/browser-test.js
@@ -365,7 +365,7 @@ function takeInstrumentation() {
     }
 
     win.addEventListener("load", () => {
-      if (win.location.href != "chrome://browser/content/browser.xul") {
+      if (win.location.href != AppConstants.BROWSER_CHROME_URL) {
         return;
       }
 
diff --git a/testing/talos/talos/bootstrap.js b/testing/talos/talos/bootstrap.js
index 7a6fa61c561f..491c8c5a016e 100644
--- a/testing/talos/talos/bootstrap.js
+++ b/testing/talos/talos/bootstrap.js
@@ -11,6 +11,7 @@
 // Reads the chrome.manifest from a legacy non-restartless extension and loads
 // its overlays into the appropriate top-level windows.
 
+ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
 ChromeUtils.import("resource://gre/modules/NetUtil.jsm");
 ChromeUtils.import("resource://gre/modules/Services.jsm");
 
@@ -27,7 +28,7 @@ const windowTracker = {
       let {document} = window;
       let {documentURI} = document;
 
-      if (documentURI !== "chrome://browser/content/browser.xul") {
+      if (documentURI !== AppConstants.BROWSER_CHROME_URL) {
         return;
       }
       initializeBrowser(window);
diff --git a/testing/talos/talos/pageloader/chrome/pageloader.js b/testing/talos/talos/pageloader/chrome/pageloader.js
index 657ebdb7017a..8e0f80ece56f 100644
--- a/testing/talos/talos/pageloader/chrome/pageloader.js
+++ b/testing/talos/talos/pageloader/chrome/pageloader.js
@@ -6,6 +6,7 @@
 /* eslint mozilla/avoid-Date-timing: "off" */
 
 ChromeUtils.import("resource://gre/modules/Services.jsm");
+ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
 ChromeUtils.import("resource://gre/modules/E10SUtils.jsm");
 
 var NUM_CYCLES = 5;
@@ -181,7 +182,7 @@ function plInit() {
       toolbars = "titlebar,resizable";
     }
 
-    browserWindow = Services.ww.openWindow(null, "chrome://browser/content/", "_blank",
+    browserWindow = Services.ww.openWindow(null, AppConstants.BROWSER_CHROME_URL, "_blank",
        `chrome,${toolbars},dialog=no,width=${winWidth},height=${winHeight}`, blank);
 
     gPaintWindow = browserWindow;
diff --git a/testing/talos/talos/tests/devtools/addon/bootstrap.js b/testing/talos/talos/tests/devtools/addon/bootstrap.js
index f753c05b0e8b..b4ec71393d25 100644
--- a/testing/talos/talos/tests/devtools/addon/bootstrap.js
+++ b/testing/talos/talos/tests/devtools/addon/bootstrap.js
@@ -11,6 +11,7 @@
 // Reads the chrome.manifest from a legacy non-restartless extension and loads
 // its overlays into the appropriate top-level windows.
 
+ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
 ChromeUtils.import("resource://gre/modules/Services.jsm");
 
 const windowTracker = {
@@ -26,7 +27,7 @@ const windowTracker = {
       let {document} = window;
       let {documentURI} = document;
 
-      if (documentURI !== "chrome://browser/content/browser.xul") {
+      if (documentURI !== AppConstants.BROWSER_CHROME_URL) {
         return;
       }
       initializeBrowser(window);
diff --git a/testing/talos/talos/tests/tart/addon/bootstrap.js b/testing/talos/talos/tests/tart/addon/bootstrap.js
index 7a6fa61c561f..491c8c5a016e 100644
--- a/testing/talos/talos/tests/tart/addon/bootstrap.js
+++ b/testing/talos/talos/tests/tart/addon/bootstrap.js
@@ -11,6 +11,7 @@
 // Reads the chrome.manifest from a legacy non-restartless extension and loads
 // its overlays into the appropriate top-level windows.
 
+ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
 ChromeUtils.import("resource://gre/modules/NetUtil.jsm");
 ChromeUtils.import("resource://gre/modules/Services.jsm");
 
@@ -27,7 +28,7 @@ const windowTracker = {
       let {document} = window;
       let {documentURI} = document;
 
-      if (documentURI !== "chrome://browser/content/browser.xul") {
+      if (documentURI !== AppConstants.BROWSER_CHROME_URL) {
         return;
       }
       initializeBrowser(window);