About 4 years ago, the Firefox developers apparently had their brains removed and decided that it was a good idea to couple the light/dark mode selection to the font used in the theme, which of course makes absolutely no sense other than to annoy the users. There used to be a workaround for this (see this thread: https://support.mozilla.org/en-US/questions/1366357), but as of the latest update the workaround doesn't work properly anymore. No matter what I try, some menus remain dark unless I switch to a light theme. This is completely unacceptable. Mozilla needs to end this stupid behavior asap, as they should have four years ago already