diff --git a/dom/media/test/mochitest.ini b/dom/media/test/mochitest.ini
index f91ecef7aaa0..010f49889235 100644
--- a/dom/media/test/mochitest.ini
+++ b/dom/media/test/mochitest.ini
@@ -831,16 +831,26 @@ tags=msg capturestream
 [test_streams_tracks.html]
 tags=msg capturestream
 [test_texttrack.html]
+tags = webvtt
 [test_texttrackcue.html]
+tags = webvtt
 [test_texttrackcue_moz.html]
+tags = webvtt
 [test_texttrackevents_video.html]
+tags = webvtt
 [test_texttracklist.html]
+tags = webvtt
 [test_texttracklist_moz.html]
+tags = webvtt
 [test_texttrackregion.html]
+tags = webvtt
 [test_texttrack_moz.html]
+tags = webvtt
 [test_timeupdate_small_files.html]
 [test_trackelementevent.html]
+tags = webvtt
 [test_trackevent.html]
+tags = webvtt
 [test_unseekable.html]
 skip-if = toolkit == 'gonk' # bug 1128845 on gonk
 [test_video_to_canvas.html]
@@ -850,8 +860,11 @@ skip-if = toolkit == 'gonk' # bug 1128845 on gonk
 [test_VideoPlaybackQuality_disabled.html]
 [test_volume.html]
 [test_vttparser.html]
+tags = webvtt
 [test_webvtt_disabled.html]
+tags = webvtt
 [test_webvtt_positionalign.html]
+tags = webvtt
 
 # The tests below contain backend-specific tests. Write backend independent
 # tests rather than adding to this list.