Bug 1494304 - Avoid duplicate head.js in browser extension tests r=aswan

Differential Revision: https://phabricator.services.mozilla.com/D6907

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

browser/components/extensions/test/browser/browser-common.ini

@@ -4,7 +4,6 @@ prefs =
     dom.animations-api.timelines.enabled=true
 support-files =
   silence.ogg
-  head.js
   head_pageAction.js
   head_sessions.js
   head_webNavigation.js

browser/components/extensions/test/browser/browser-remote.ini

@@ -8,10 +8,10 @@
 install-to-subdir = test-oop-extensions
 tags = webextensions remote-webextensions
 skip-if = !e10s
-
-[browser_ext_popup_select.js]
-skip-if = debug || os != 'win' # FIXME: re-enable on debug build (bug 1442822)
 support-files =
   head.js
 
+[browser_ext_popup_select.js]
+skip-if = debug || os != 'win' # FIXME: re-enable on debug build (bug 1442822)
+
 [include:browser-common.ini]

browser/components/extensions/test/browser/browser.ini

@@ -1,6 +1,5 @@
 [DEFAULT]
 tags = webextensions in-process-webextensions
-
 support-files =
   head.js