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Firefox 54.0 no longer plays videos in Twitter
Firefox 54.0 will no longer play videos in Twitter. The video tries to start but eventually displays "The media cannot be played". I only have two addons: OpenH264 Video Codec (always activate) and Shockwave Flash 26.9r (always activate). This is a 64bit microsoft windows 7 operating system running Firefox 32 bit 54.0. Microsoft has all current updates installed.
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Is your Firefox generally able to play H.264-coded / MPEG 4 video? One diagnostic is YouTube's test page here:
Another is the video players down this page (ignore the Firefox 4 beta info at the top):
Regarding add-ons, since you shared your extensions list, I see you have Adblock Plus. Sometimes that is a factor if there are "pre-roll" ads in the video player.