I got prompted by Firefox to "test pilot" this new feature. When I enabled it, my stats and settings (i.e. dark mode) were forgetting. Disabling the new setting fixed it and everything was saved. This seems like a bug (or "feature") with the new Firefox setting, but just wanted to give a heads-up to anybody who runs into it.

Firefox developer here! I've filed a bug for this: https://bugzilla.mozilla.org/show_bug.cgi?id=1770433

When you run into issues like these you can disable Enhanced Tracking Protection via the shield icon in the address bar. This will only disable protections for that specific site. Here is how it works: https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-deskto...