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missing x button

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sometimes when i close a tab, all tabs lose the close tab button, does someone know why?

sometimes when i close a tab, all tabs lose the close tab button, does someone know why?

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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