Created attachment 8630577 [details] BlackBarOverTabs.png Black bar shows up over top of tabs and Mac OS Ui buttons at top of browser. Tried restarting firefox over and over, the black bar usually persists. There have been a few times where re-opening firefox causes it to disappear.
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1136499
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