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YouTube video not fitting on the screen

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For some days I have an issue with playing YouTube videos in Mozilla android browser: videos appear as if they were enlarged several times, and I only see a top left corner of the video in low resolution. Full-screen mode, "view for PC" browser option did not change it. I tried reinstalling app, also installed Firefox nightly - the issue remained. On the other hand, videos on other websites, YouTube in chromium based browsers, Firefox on other devices do not have this issue. What could it be?

For some days I have an issue with playing YouTube videos in Mozilla android browser: videos appear as if they were enlarged several times, and I only see a top left corner of the video in low resolution. Full-screen mode, "view for PC" browser option did not change it. I tried reinstalling app, also installed Firefox nightly - the issue remained. On the other hand, videos on other websites, YouTube in chromium based browsers, Firefox on other devices do not have this issue. What could it be?
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