I did try that out, when I was seeing if I could stand switching after multiprocess stuff landed. It's closer to the fairly-polished Chrome experience if you us

I did try that out, when I was seeing if I could stand switching after multiprocess stuff landed. It's closer to the fairly-polished Chrome experience if you use about:profiles, rather than messing around with custom command lines. But, as you say, the problem with that is that it doesn't handle opening links correctly. I could see if I could write a URL handler that queries the window manager to find the last Firefox window that had focus on the current desktop (probably possible, but I'm unfamiliar with that domain)... or I could view Firefox not supporting this natively as a sign that it doesn't think my use case is very important, and stick with a browser that works without jumping through hoops. It's not that I'm averse to putting some work in, per se -- I'm now in the middle of poking at writing a Firefox add-on to see if I can fix my complaints about insufficiently sticky containers -- it's just that writing my own OS url handler is a bit too hacky for my tastes.