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Bordered window showing mostly on mouse over on mostly sites

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I have attached screenshot for your reference sometimes black border sometimes white create problem.

Kindly assist me to resolve this issue.

Thanks & Regards, Kamal

I have attached screenshot for your reference sometimes black border sometimes white create problem. Kindly assist me to resolve this issue. Thanks & Regards, Kamal
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Всички отговори (2)

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Could you test in Firefox's Safe/Troubleshoot Mode? In that mode, Firefox temporarily deactivates extensions, hardware acceleration, any userChrome.css/userContent.css files, and some other advanced features to help you assess whether these are causing the problem.

If Firefox is running:

You can restart Firefox in Safe/Troubleshoot Mode using either:

  • "3-bar" menu button > Help > Troubleshoot Mode... (before Fx88: Restart with Add-ons Disabled)
  • (menu bar) Help menu > Troubleshoot Mode... (before Fx88: Restart with Add-ons Disabled)

and OK the restart. A small dialog should appear. Click the Open button (before Fx88: "Start in Safe Mode" button).

If Firefox is not running:

Hold down the Shift key when starting Firefox. (On Mac, hold down the option/alt key instead of the Shift key.) A small dialog should appear. Click the Open button (before Fx88: "Start in Safe Mode" button).

Note: Don't use the Refresh without first reviewing this article to understand what will be deleted: Refresh Firefox - reset add-ons and settings.

Any improvement?

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Since you already have a thread on this problem, let's continue here:

https://support.mozilla.org/questions/1317426