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Firerfox resizes when closing a tab

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I can be on Firefox with multiple tabs open. then some of the time (not all the time) when I close a tab Firefox will Restore Down (resize) on it's own. I have to then click Maximize to get the full page again. it has only been doing this for the past few days but it's annoying.

I can be on Firefox with multiple tabs open. then some of the time (not all the time) when I close a tab Firefox will Restore Down (resize) on it's own. I have to then click Maximize to get the full page again. it has only been doing this for the past few days but it's annoying.

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Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window