That sounds like an interesting idea, I’ll test that out, thanks!

I thought about this solution, as it is the “cleanest”, however I need on total 4 firefox derivatives. Unfortunately, when looking deeply into the options, i haven’t found 4 that are similarly trustworthy, well maintained etc. Also i have my firefox config fully figured out, it works and is as private as i want them, without some maintainer forcing their opinion on my use cases. Plain firefox is the easiest to configure, as it’s like a blank start. However i might be wrong here and am open to suggestions :D

Unfortunately that is not what I am looking for. I am already using named profiles. Like i stated in my original post as well as my answers below, this only works from Inside Firefox, however from the operating system pov it is still treated as the same application. Which means:

a) When i share the work profile, i also share all other profiles, as they are all Firefox b) When I quick access firefox via spotlight, i end up at the nearest, random profile / instance of firefox. c) There is no way to differentiate the profiles on an application level. d) I can not assign the instances to different desktops, as they are all Firefox.