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YouTube won't go full screen

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You Tube will not go full screen. I've tried reinstalling, clearing cache, refreshing page, pressing F11. Nothing works. It will go full screen in a private browser, but not in a normal one.

You Tube will not go full screen. I've tried reinstalling, clearing cache, refreshing page, pressing F11. Nothing works. It will go full screen in a private browser, but not in a normal one.
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การตอบกลับทั้งหมด (2)

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I wonder whether this a problem with the F11 key being blocked/intercepted by the site or an add-on. Could you test whether the full screen button on the menu works -- it is the last one on the Zoom row.

มีประโยชน์หรือไม่

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I don't think F11 or Firefox's built-in full screen is relevant, so please ignore that. The display in your screenshot is somewhat similar to when you scroll down, but presumably you didn't scroll down. Does scrolling up/down/up make any difference?

There are a couple new threads on r/Firefox about this, too:

Users there reported that if they are signed out or using a private window (where, presumably, they didn't sign in to their accounts), then the problem doesn't occur.

Maybe Google made a change?

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