Tabs no longer display the "close" button. I have to close by right clicking and selecting "Close Tab".
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No 'x' appears at the top of each tab allowing you to close a single tab. You can only close by right clicking and choosing "close tab" from the menu that appears.
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Try:
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
See: