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Full screen shows bands on top and left, first time, but doesn't do it in private window or second time

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When I first use full-screen mode with Firefox, small bands appear on the top and left sides of the full-screen window. The second time I use it, it appears normally.

I have tried a fresh profile, it doesn't happen in a fresh profile. I have tried in safe-mode, doesn't happen in safe-mode. I have tried turning off all extensions, it still happens.

When I run in a private window, it doesn't happen either.

Any idea what's happening in safe-mode and a private window that fixes the problem.

It's really just an annoyance, but I'd like to nail this bizarre behavior down and fix it.

Any ideas? Thanks.

When I first use full-screen mode with Firefox, small bands appear on the top and left sides of the full-screen window. The second time I use it, it appears normally. I have tried a fresh profile, it doesn't happen in a fresh profile. I have tried in safe-mode, doesn't happen in safe-mode. I have tried turning off all extensions, it still happens. When I run in a private window, it doesn't happen either. Any idea what's happening in safe-mode and a private window that fixes the problem. It's really just an annoyance, but I'd like to nail this bizarre behavior down and fix it. Any ideas? Thanks.
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