MP4 video does not play in Firefox 35.0.1

Some of my MP4 videos do not play in Firefox. They worked very well last week. Now, I get the message "Video cannot be played because the file is corrupted. The video works fine in IE, Chrome, Opera, Safari

I use Firefox with 4 profiles. One of them had problem work mp4. When I opened http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4 mp4 it says "Video cannot be played because the file is corrupted.".

After I compared the two profiles prefs.js files, I saw that "media - media.windows - foundation.enabled" was false. I opened Subject: config and reset "media.windows - media - foundation.enabled. After restarting Firefox http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4 works perfectly.

Tags: Firefox

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