Bug 1402944: Follow-up: Also disable test_ext_webrequest_background_events on Windows debug. r=me

MozReview-Commit-ID: Hc45POKbh9S

toolkit/components/extensions/test/mochitest/mochitest-common.ini

@@ -128,7 +128,7 @@ skip-if = os == 'android' && debug # bug 1397615
 [test_ext_webrequest_auth.html]
 skip-if = os == 'android'
 [test_ext_webrequest_background_events.html]
-skip-if = os == 'android' # bug 1402944
+skip-if = os == 'android' || (os == 'win' && debug) # bug 1402944
 [test_ext_webrequest_hsts.html]
 [test_ext_webrequest_basic.html]
 skip-if = os == 'android' && debug # bug 1397615