So I'm usually not logged in when I use the site. I only log in when I need to do something "premium." As of today, it seems I can't get the site to stay in the dark theme unless I'm logged in. When I click the dark theme button at the top of the page, it loads the current page with the dark theme as it should. However, the next time I click any link at all, the new page loads up with the light theme again.
Since it works just fine when I'm logged in, my theory is that it must be attached to something new with ads/advertising. Has anything changed in that area that might have broken the theme stuff? I use up-to-date Firefox.