I made the mistake of trying a different Firefox theme in *one* instance of Firefox and of course my Firefox instances *everywhere else* immediately reverted to the default theme
@jmtd I'm having enough problems with one instance of firefox chewing up RAM (Must look into cgroups...) that I decided against running multiple simultaneous profiles. Tab groups is ok, but I wish I could have different plugins (password managers primarily) in each - that's the thing that sometimes makes me wish I used separate profiles.
@sxa ah these instances were at least on separate computers in my case (with firefox sync probably the culprit for theme weirdness)