If you are trying to play a video in the Firefox browser but receive a Video format or MIME type is not supported error message on the player, these solutions are ...
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Firefox 134 brings improved video playback, security fixes, and moreSeven security flaws have been fixed in Firefox ESR 128.6.0 and two in Firefox ESR 115.19.0. Tor Browser 14.0.4, based on Firefox ESR 128.6.0, will be available soon.
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