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thin black bar appear in bottom right corner of firefox

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  • 1 has this problem
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  • Last reply by guigs

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recently i noticed thin black bar appear in bottom right corner of firefox window. then i noticed thin black bar appear in button tooltip too.

this bar gone when i start firefox in safe mode, so i decided to refresh firefox to delete addons and plugins, but it still there.

then i tried to uninstall firefox, download and install a fresh one, same bar appear, gone when in safe mode, i didnt add any plugin or extension yet.

i'll add images later, as i post this in safe mode.

recently i noticed thin black bar appear in bottom right corner of firefox window. then i noticed thin black bar appear in button tooltip too. this bar gone when i start firefox in safe mode, so i decided to refresh firefox to delete addons and plugins, but it still there. then i tried to uninstall firefox, download and install a fresh one, same bar appear, gone when in safe mode, i didnt add any plugin or extension yet. i'll add images later, as i post this in safe mode.
Attached screenshots

Modified by benn

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Any graphics issues flag that there might be an issue with extensions or graphics acceleration.

Please take a look at these troubleshooting steps: