Huh, I had no idea the <profile> argument to -P is optional (--help does not say), I was always using --ProfileManager instead. Nice quality of life improvement, thanks for the information!

ah well, ironically I had no idea that -P could take a profile-name arg.. I always used it without to trigger the gui .. so I return the thanks

That used to be a start menu entry in the old days. I had heard it was removed but to my surprise -P works on my current linux. I'll have to see if it does actually start a new profile.

Does it still work?

yes. I just started using it last week to split work related browsing from personal stuff.