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About you tube viewing

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Whenever I open you tube video a sign comes video format MMIF not supported. What's the remedy? On other browsers there is no problem.

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Hello, as I can see in the firefox release notes, it seems that the Android core must ask you about what app do you want to use when you open an youtube URL, like the attached image. If not, try to open the video directly in the Youtube app. Because you have the app installed, not?