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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.
Volga89
Posted 2018-12-05T16:52:03.657
Reputation: 113
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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:
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
Posted 2018-12-05T16:52:03.657
Reputation: 306 093
Bingo. Selecting "Restart with Add-ons Disabled" seemed to work. I had to re-launch Firefox manually, but the effect was gone. BUT, when I go to the add-on page three of the four seemed to be enabled, and it looks like they are active now. I'm a little perplexed by that. – Volga89 – 2018-12-06T21:50:29.040
Ooops...meant to add this: I'm using the XP Default theme. Should I change that for any reason? – Volga89 – 2018-12-06T21:52:04.677
I think it was the XP Default theme that had gone rogue. Once I restarted in safe mode, I could enable it without a problem. After that, the problem has remained fixed. Sorta makes sense, because the problem was with the display. Thanks. – Volga89 – 2018-12-07T20:10:04.550
1Apologies--I don't know why my image descriptions don't show up. – Volga89 – 2018-12-05T16:53:02.407
Ooops, too many 60-range numbers. Yes, I'm running 63.0.3. I'll try to edit the question. Thanks. – Volga89 – 2018-12-06T21:43:29.350