diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index 019b168c1aeae7e1c97a3ae58c99a48a27f54134..1f051e8a1e8a58e8bb721196deecfa36f4089dd6 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -32,6 +32,7 @@ ChromeUtils.defineESModuleGetters(this, {
   ContextualIdentityService:
     "resource://gre/modules/ContextualIdentityService.sys.mjs",
   CustomizableUI: "resource:///modules/CustomizableUI.sys.mjs",
+  ZenCustomizableUI: "chrome://browser/content/ZenCustomizableUI.sys.mjs",
   DevToolsSocketStatus:
     "resource://devtools/shared/security/DevToolsSocketStatus.sys.mjs",
   DownloadUtils: "resource://gre/modules/DownloadUtils.sys.mjs",
@@ -632,6 +633,15 @@ XPCOMUtils.defineLazyPreferenceGetter(
   false
 );
 
+const ZEN_WELCOME_PATH = "zen-welcome";
+const ZEN_WELCOME_ELEMENT_ATTR = "zen-dialog-welcome-element";
+XPCOMUtils.defineLazyServiceGetter(
+  this,
+  "ProfileService",
+  "@mozilla.org/toolkit/profile-service;1",
+  "nsIToolkitProfileService"
+);
+
 customElements.setElementCreationCallback("screenshots-buttons", () => {
   Services.scriptloader.loadSubScript(
     "chrome://browser/content/screenshots/screenshots-buttons.js",
@@ -3440,6 +3450,10 @@ var XULBrowserWindow = {
     AboutReaderParent.updateReaderButton(gBrowser.selectedBrowser);
     TranslationsParent.onLocationChange(gBrowser.selectedBrowser);
 
+    gZenViewSplitter.onLocationChange(gBrowser.selectedBrowser);
+    ZenWorkspaces.onLocationChange(gBrowser.selectedBrowser);
+    gZenTabUnloader.onLocationChange(gBrowser.selectedBrowser);
+
     PictureInPicture.updateUrlbarToggle(gBrowser.selectedBrowser);
 
     if (!gMultiProcessBrowser) {
@@ -4435,7 +4449,7 @@ nsBrowserAccess.prototype = {
     // Passing a null-URI to only create the content window,
     // and pass true for aSkipLoad to prevent loading of
     // about:blank
-    return this.getContentWindowOrOpenURIInFrame(
+    let res = this.getContentWindowOrOpenURIInFrame(
       null,
       aParams,
       aWhere,
@@ -4443,6 +4457,10 @@ nsBrowserAccess.prototype = {
       aName,
       true
     );
+    if (typeof window.gZenGlanceManager !== "undefined" && window.toolbar.visible) {
+      window.gZenGlanceManager.onTabOpen(res, aURI);
+    }
+    return res;
   },
 
   openURIInFrame: function browser_openURIInFrame(
@@ -7285,6 +7303,12 @@ var gDialogBox = {
     parentElement.showModal();
     this._didOpenHTMLDialog = true;
 
+    if (uri.includes(ZEN_WELCOME_PATH)) {
+      parentElement.setAttribute(ZEN_WELCOME_ELEMENT_ATTR, true);
+    } else if (parentElement.hasAttribute(ZEN_WELCOME_ELEMENT_ATTR)) {
+      parentElement.removeAttribute(ZEN_WELCOME_ELEMENT_ATTR);
+    }
+
     // Disable menus and shortcuts.
     this._updateMenuAndCommandState(false /* to disable */);