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Menu bar and inactive tabs zone changes color when window is in background

  • 5 replies
  • 1 has this problem
  • Last reply by jadewolf

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Since the last update, my Nightly displays the menu bar and tabs under it in green (the color my Windows is set to) while keeping the active tab black (as it should be, since I'm using the dark theme) but with a blue line along the top (glitch? feature? looks like a glitch). However, when the Nightly window is in the background, like when I switch to a windows explorer window, everything goes back to being uniform black (which is how it should be and how I want it).

What can I do to get it back to normal? Besides changing my whole Windows 10 color theme to black? The constant color change whenever I alt-tab is getting kinda annoying.

All Replies (5)

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Hi jadewolf, if I understand correctly, you do not want Firefox to follow your Windows color scheme but instead to use a dark theme on all Firefox windows. Does it make any difference if you switch between Firefox's "Default" and "Dark" themes? See: Built-in themes in Firefox - alternative to complete themes.

Regarding a blue line along the top of the active tab, that was added in the Photon redesign in Firefox 57. To hide the line, you need to add a custom style rule in a userChrome.css file. For example, (old thread, not tested in latest versions).

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Nope, no difference between dark and default. When I have another app in the forefront, it works correctly, the menu bar is black, but as soon as I come back to FF it goes windows color scheme color green.

I'm pretty sure before this latest patch it was always black, forefront or background.

Ok for the blue line! I can live with that one, anyway. Thanks!

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Does the preference change in the following reply make any difference:

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There were some Theme related changes in recent Nightly updates as you can see mentioned in and

Also with Nightly development channel getting checkins with two updates each day can sometimes lead to issue(s) until fixed, finished or reverted. It also means you see changes sooner compared to Beta and Release.

Modified by James

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Adding a ui.systemUsesDarkTheme integer at 0 doesn't work either. I'm guessing it's just a bug in this version, might just go back to using classic firefox until it's fixed,