Bug 1608336 - Disable Touch Bar for non-chrome windows. r=mikedeboer

Differential Revision: https://phabricator.services.mozilla.com/D62259

--HG--
extra : moz-landing-system : lando

browser/components/touchbar/MacTouchBar.js

@@ -294,6 +294,16 @@ class TouchBarHelper {
       Ci.nsIMutableArray
     );
 
+    let window = TouchBarHelper.window;
+    if (
+      !window ||
+      !window.isChromeWindow ||
+      window.document.documentElement.getAttribute("windowtype") !=
+        "navigator:browser"
+    ) {
+      return layoutItems;
+    }
+
     // Every input must be updated at least once so that all assets (titles,
     // icons) are loaded. We keep track of which inputs haven't updated and
     // run an update on them ASAP.