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Get a black bar across left side of tabs when changing from one to another. Does this happen to others?

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chemdoc
chemdoc
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When I open a new tab or attempt to change within open tabs a broad black line pops up over the left portion of the tabs area. It stays as long a 1 minute then goes away. Has anyone else had this problem and do you have a fix for this bug?

When I open a new tab or attempt to change within open tabs a broad black line pops up over the left portion of the tabs area. It stays as long a 1 minute then goes away. Has anyone else had this problem and do you have a fix for this bug?

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cor-el
cor-el
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).