--- a/content/media/test/mochitest.ini
+++ b/content/media/test/mochitest.ini
@@ -17,17 +17,17 @@
 # throws an error (and does not cause a crash or hang), just add it to
 # gErrorTests in manifest.js.
 
 # To test for a specific bug in handling a specific resource type, make the
 # test first check canPlayType for the type, and if it's not supported, just
 # do ok(true, "Type not supported") and stop the test.
 
 [DEFAULT]
-skip-if = buildapp == 'mulet' || contentSandbox != 'off' # contentSandbox(Bug 1042735)
+skip-if = buildapp == 'mulet'
 support-files =
   320x240.ogv
   320x240.ogv^headers^
   448636.ogv
   448636.ogv^headers^
   VID_0001.ogg
   VID_0001.ogg^headers^
   allowed.sjs

--- a/content/media/webaudio/test/mochitest.ini
+++ b/content/media/webaudio/test/mochitest.ini
@@ -1,10 +1,10 @@
 [DEFAULT]
-skip-if = ((buildapp == 'mulet' || buildapp == 'b2g') && (toolkit != 'gonk' || debug)) || contentSandbox != 'off' #b2g-debug,b2g-desktop(bug 916135); contentSandbox(Bug 1042735)
+skip-if = ((buildapp == 'mulet' || buildapp == 'b2g') && (toolkit != 'gonk' || debug)) #b2g-debug,b2g-desktop(bug 916135)
 support-files =
   audio-expected.wav
   audio-mono-expected-2.wav
   audio-mono-expected.wav
   audio-quad.wav
   audio.ogv
   audioBufferSourceNodeNeutered_worker.js
   invalid.txt

--- a/dom/media/tests/mochitest/mochitest.ini
+++ b/dom/media/tests/mochitest/mochitest.ini
@@ -1,10 +1,9 @@
 [DEFAULT]
-skip-if = contentSandbox != 'off' # contentSandbox(Bug 1042735)
 support-files =
   head.js
   constraints.js
   mediaStreamPlayback.js
   pc.js
   templates.js
   NetworkPreparationChromeScript.js
   blacksilence.js