diff --git a/testing/web-platform/meta/media-source/mediasource-is-type-supported.html.ini b/testing/web-platform/meta/media-source/mediasource-is-type-supported.html.ini
index b8ea4b721f6f..c0155c5220d6 100644
--- a/testing/web-platform/meta/media-source/mediasource-is-type-supported.html.ini
+++ b/testing/web-platform/meta/media-source/mediasource-is-type-supported.html.ini
@@ -2,27 +2,35 @@
   type: testharness
   prefs: [media.mediasource.enabled:true]
   [Test invalid MIME format "video/webm"]
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1191833
     expected: FAIL
 
   [Test invalid MIME format "video/webm;"]
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1191833
     expected: FAIL
 
   [Test invalid MIME format "video/webm;codecs"]
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1191833
     expected: FAIL
 
   [Test invalid MIME format "video/webm;codecs="]
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1191833
     expected: FAIL
 
   [Test invalid MIME format "video/webm;codecs=""]
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1191833
     expected: FAIL
 
   [Test invalid MIME format "video/webm;codecs="""]
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1191833
     expected: FAIL
 
   [Test valid WebM type "AUDIO/WEBM;CODECS="vorbis""]
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1191833
     expected: FAIL
 
   [Test invalid mismatch between major type and codec ID "audio/webm;codecs="vp8""]
+    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1191833
     expected: FAIL
 
   [Test valid MP4 type "audio/mp4;codecs="mp4a.67""]