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Browser Theme support changed... breaking my customization.

  • 2 replies
  • 1 has this problem
  • Last reply by Franpa

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Ffff Firefox 96 ruined the "System Theme" theme. Now all tne UI is the same light shade instead of parts of it being gray, the New Tab button was also modified in v96.

I tried overriding the colour in chrome.css which works... when I define a random colour like #111111 but it doesn't work when I define the desired #e4e4ea colour. I assume Paint 3D & GIMP are giving the correct hexadecimal colour codes when using their Colour Picker's.

  1. TabsToolbar {

height: var(--tab-min-height) !important; margin-bottom: 1px !important; background-color: #e4e4ea !important;}

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Firefox now harmonises more elements with your toolbar theme. When the text color on your background tabs is light/white, it triggers Firefox to use a dark background on menus, the sidebar, the Library window, and various built-in pages. Firefox also signals sites that you have a dark theme preference.

You can download a different theme from

I hope that this helps.


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Is there a way to disable that so that it doesn't interfere with userchrome.css customizations?


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