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I have this: Dell XPS 13, running Windows 8.1 & Classic Shell, with an extended display to an HP 22 uh monitor.

Mozilla Firefox Quantum 63.0.3 (64-bit) gets a darkened rectangle in the upper left corner when greater than a certain size. The issue is not location on the screen. I've included images of the effect, and my screen resolution dialogue. Any thoughts would be appreciated. Of course, I can work around this.

This is the effect. No shading when sized smaller. No shading when moved to upper left. My screen resolution dialogue.

Volga89
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1 Answers1

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Sometimes this problem is caused by a non-standard theme. If you have installed or created a theme, try to use standard theme in order to check.

Otherwise, try to restart Firefox in Safe mode. If this solves the problem, then the problem is caused by an add-on:

  • Click the menu button
  • Click Help
  • Select Restart with Add-ons Disabled….

If the problem still exists in Safe mode, resetting Firefox might help. First backup your profile and export bookmarks, then Refresh Firefox:

The refresh feature fixes many issues by restoring Firefox to its default state while saving your essential information like bookmarks, passwords, and open tabs.

Important: Since Firefox will revert to its original state, your own configurations and customizations, including extensions, extension data, and about:config preference configurations are removed. If you've made accessibility configurations, you may need to change them back after refreshing.

harrymc
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