FF 97.0 Themes revert to white whenever relaunching FF
I love that you added a proper dark theme, and also even more-so one that is supposed to follow the Windows theme (System Theme - auto).
However, whichever I select it defaults back to basic White theme when I reopen Firefox.
I used to have a custom Firefox Color theme, which disappeared after the update to 97 - but the new Auto and Dark are perfect. Although not cool to blow away a theme created using FF Color - lucky I was OK not using it.
Looked at various forums and sites and as of yet not found any reports.
No custom .js files being used, just the prefs.js
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Hi Alex,
Yeah, I certainly empathise with this as well.
The reason is due to a new auto theme detection implemented from Firefox 96.0 which checks the style of one's toolbars for a custom theme. Then it applies styling accordingly to what shade is detected. For me it was the other way around, with a dark theme when I wanted the UI to remain light themed (other than on the toolbar itself). It all depends on the brightness of theme we each use.
Looking into this, I managed to find a solution using AutoConfig which allows forcing preferences to be applied even when opening a new browser window (or restarting Firefox completely).
See this post here for details: https://support.mozilla.org/en-US/questions/1360389?page=2#answer-1479952
Since you wish to keep a Dark mode, the method will be slightly different than explained. This will require setting a value of 0 instead of 1 inside the firefox.cfg file. The custom rule is then what locks down the preference to tell Firefox which theme is desired at all times.
Hopefully this might help you.
-CB
If you have uBlock Origin, one of its settings relates to the theme. Perhaps one of your add-ons has something similar.