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My question is about fullscreen.I can't make videos fullscreen as the way I want,I wish you could help me about this please :)

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Like in youtube,udemy and some video resources

Like in youtube,udemy and some video resources

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What is the way you want? Do you mean that it can't go fullscreen altogether or it's doing it in a specific way?

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Hey thanks for reply but I could do it yesterday,my problem was about animation :)

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With animation? I can only guess you're referring to the transition animation in going in and out of full screen? If so, then I assume this was changed in about:config by changing

  • full-screen-api.transition-duration.enter
  • full-screen-api.transition-duration.leave

both to 0 0. Anyways, glad to hear you found a solution.