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Error "No video with supported format and MIME type found"

SentleXR

Error "No video with supported format and MIME type found" when trying to play video in many third-party players in FireFox Nightly. There is no such error in Firefox/Beta; everything works normally. What should I do? I don't want to switch to Firefox; it doesn't have about:config. And in Firefox Beta, there are no options "Enable Isolated Processes with Zygote Preloading (requires restart)" and "Enable Isolated Content Process (requires restart)", which prevent tabs from being loaded in the background. Nightly updates don't help.

Error "No video with supported format and MIME type found" when trying to play video in many third-party players in FireFox Nightly. There is no such error in Firefox/Beta; everything works normally. What should I do? I don't want to switch to Firefox; it doesn't have about:config. And in Firefox Beta, there are no options "Enable Isolated Processes with Zygote Preloading (requires restart)" and "Enable Isolated Content Process (requires restart)", which prevent tabs from being loaded in the background. Nightly updates don't help.
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