Bug 1379508: Follow-up: Disable select popup test on Linux for frequent intermittent failures.

MozReview-Commit-ID: GiHc1OVMFEh

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

@@ -10,7 +10,7 @@ tags = webextensions remote-webextensions
 skip-if = !e10s
 
 [browser_ext_popup_select.js]
-skip-if = os == 'mac' # Select popup alignment is unusual on Mac, so test fails
+skip-if = os != 'win'
 support-files =
   head.js