Themes change after restart
When I restart Firefox, the theme always reverts back to the original. It doesn't matter what theme I use.
Firefox Quantum MacBookAir Big Sur OS
Chosen solution
It's the new Firefox Color for Quantum extension.
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https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save
Note: Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.
Make sure you install Firefox properly and that you do not run Firefox from within the DMG (Disk Images) file.
Open the Firefox Disk Images file and drag the Firefox application to the Applications folder on your hard drive. You shouldn't double-click the Firefox application to run it from the Disk Images, but instead drag it out of the DMG folder.
I did install it properly.
The theme is the only thing with which I am having a problem.
Seçilmiş Həll
It's the new Firefox Color for Quantum extension.
That was very good work. Well Done.