Fix test_cookie_tracker_detection in Firefox #1245
Description
Currently failing on master in Firefox. Was disabled when Selenium tests in Firefox were merged, re-enabled as part of #1205 (git bisect seemed to lead me to 936a1f8), but isn't working still:
________________________________ CookieTest.test_cookie_tracker_detection ________________________________
...
> window_utils.close_windows_with_url(self.driver, self.popup_url)
selenium/cookie_test.py:77:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
...
> raise Exception("was not able to find window for url " + url)
E Exception: was not able to find window for url moz-extension://37702c80-1338-4638-b07a-33e87fa5327d/skin/popup.html
selenium/window_utils.py:54: Exception