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How to import Modified manifest.json theme to FireFox on Linux?

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  • Last reply by cor-el

Achak Claw
Achak Claw
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I'm wanting to add this theme file to firefox since Cheers - Bold has ended since it was a limited time. How can I import this into firefox so I can use it for myself?

I'm wanting to add this theme file to firefox since Cheers - Bold has ended since it was a limited time. How can I import this into firefox so I can use it for myself?
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cor-el
cor-el
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Cheers is still present in Firefox 97 as a built-in monochromatic theme.

  • resource://builtin-themes/monochromatic/cheers/

You can add the theme ID to the browser.theme.retainedExpiredThemes pref that you need to create as a new string pref if it doesn't exist.

The browser.theme.retainedExpiredThemes pref has an array list ([ID1,ID2]) of extension IDs. You can find the ID in its manifest.json file.

See also: