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strange stripe on top of firefox browser

returndeneb
returndeneb
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I'm using upper and lower setting monitor

When I maximize Firefox browser on bottom monitor,

a black bar intrude upper monitor

I'm using upper and lower setting monitor When I maximize Firefox browser on bottom monitor, a black bar intrude upper monitor
Attached screenshots

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returndeneb
returndeneb Question owner
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using windows os,

tried reinstall, safemode, hardware acceleration off, customized theme, change size of firefox's menu