Bug 1563040 - [marionette] Call window.focus() directly for the newly opened window. r=webdriver-reviewers,ato

Differential Revision: https://phabricator.services.mozilla.com/D36873

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

testing/marionette/browser.js

@@ -353,11 +353,7 @@ browser.Context = class {
           subject => subject == win
         );
 
-        // Bug 1509380 - Missing focus/activate event when Firefox is not
-        // the top-most application. As such wait for the next tick, and
-        // manually focus the newly opened window.
-        win.setTimeout(() => win.focus(), 0);
-
+        win.focus();
         await Promise.all([activated, focused, startup]);
 
         // The new window shouldn't get focused. As such set the

testing/marionette/harness/marionette_harness/runner/mixins/window_manager.py

@@ -163,10 +163,7 @@ class WindowManagerMixin(object):
                     let win = window.openDialog(url, null, "chrome,centerscreen");
                     let focused = waitForFocus(win);
 
-                    // Bug 1509380 - Missing focus/activate event when Firefox is not
-                    // the top-most application. As such wait for the next tick, and
-                    // manually focus the newly opened window.
-                    win.setTimeout(() => win.focus(), 0);
+                    win.focus();
                     await focused;
 
                     // The new window shouldn't get focused. As such set the