Some tabs remain open after closing them
When I have opened a lot of tabs (10+) and I close them afterwards, sometimes a few of those tabs will still show in the tab bar. When I click them I can't view them though. It seems to be a problem with the tab bar, not with web pages.
Alla svar (1)
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).
- Don't make any changes on the Safe mode start window.
- https://support.mozilla.org/kb/Safe+Mode