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'dark' mode after Firefox update 12 July

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

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Hi, since 12 July update, any theme with a darkish colour is now leading to full dark mode on screen, i.e. web page is in dark mode, sidebar is dark mode etc. Whereas pre-update the screen/sidebar were light, which is how I like it.

The only way I can keep light mode now is have a 'bright' i.e. light coloured theme.

This doesn't seem right does it?

How can I keep my old, pre 12 July theme(s), or new ones and still work with light screen?


All Replies (2)

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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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As well as selecting the right theme, a preference setting may help:


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