--- a/dom/media/mediasource/test/mochitest.ini
+++ b/dom/media/mediasource/test/mochitest.ini
@@ -1,10 +1,10 @@
 [DEFAULT]
-skip-if = e10s || buildapp == 'b2g' # b2g( ReferenceError: MediaSource is not defined)
+skip-if = buildapp == 'b2g' # b2g( ReferenceError: MediaSource is not defined)
 support-files =
   mediasource.js
   seek.webm seek.webm^headers^
   seek_lowres.webm seek_lowres.webm^headers^
   bipbop/bipbop2s.mp4 bipbop/bipbop2s.mp4^headers^
   bipbop/bipbopinit.mp4 bipbop/bipbop_audioinit.mp4 bipbop/bipbop_videoinit.mp4
   bipbop/bipbop1.m4s bipbop/bipbop_audio1.m4s bipbop/bipbop_video1.m4s
   bipbop/bipbop2.m4s bipbop/bipbop_audio2.m4s bipbop/bipbop_video2.m4s