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Twitter videos not playing except in a new Profile

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I've tried lots of things including restarting in Safe Mode but nothing worked. When I created a new profile all videos played fine. Is there any way to fix this without going through the hassle of redownloading all add ons and extensions for a new profile?

FF version 54.0.1 OS X 10.11.6

Thanks Edit: Turns out that some extension changed the media.autoplay setting in about:config. All is fine now.

Modified by Aymondo