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Can't click on "+" icon (new tab)

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I put "+" icon (new tab) to the up-left corner of window. But after update to 55.0, I can't click it with moving cursor in corner pixel (I have to move cursor some pixels right or down). Maybe someone could help me what to do with this problem.

I put "+" icon (new tab) to the up-left corner of window. But after update to 55.0, I can't click it with moving cursor in corner pixel (I have to move cursor some pixels right or down). Maybe someone could help me what to do with this problem.

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Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window