missing x button
sometimes when i close a tab, all tabs lose the close tab button, does someone know why?
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Screenshot of your settings for general and security and screen of a open browser so others can see what's missing.
Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome.css is causing the problem.
- switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
- do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window