--- a/dom/media/test/mochitest.ini
+++ b/dom/media/test/mochitest.ini
@@ -881,13 +881,16 @@ tags = webvtt
 # The tests below contain backend-specific tests. Write backend independent
 # tests rather than adding to this list.
 [test_can_play_type_webm.html]
 [test_can_play_type_wave.html]
 [test_fragment_noplay.html]
 [test_fragment_play.html]
 
 [test_background_video_suspend.html]
+skip-if = (os == 'win' && os_version == '5.1')
 tags = suspend
 [test_background_video_no_suspend_short_vid.html]
+skip-if = (os == 'win' && os_version == '5.1')
 tags = suspend
 [test_background_video_no_suspend_disabled.html]
+skip-if = (os == 'win' && os_version == '5.1')
 tags = suspend