@mcc 1. Yes. I'm not sure if it's exactly the same as PWAs. I think it's like "install PWA" if there is a PWA, but otherwise just makes the tab into its own window/taskbar item that you can pin to the taskbar if you want.

2. If you get it from a.m.o, probably. I assume you can get a build from outside of a.m.o without that. I'm not sure.

3. AFAIK no. I find Profiles largely useless except for testing how things would behave in a completely vulnerable browser, and for that just running with $HOME pointed to something else (and a suitable sandbox since it's wide open) works better for me than Profiles. Container tabs and First-party Isolate meet my needs better for everything else.