I would also like something like the easy user switching that chrome has, since once user would have one set of session tab logins (twitter, fb, google, etc), and another user would have another. firefox -no-remote isn't that smooth of an experience compared to chrome's user switcher.
I can't really speak to Firefox's performance issues though. I feel like they're just as good on rendering and JS speed, but the overall UI doesn't have the same "fast" feel that Chrome does. Chrome has also seemingly gotten slower for me too.
[0] https://addons.mozilla.org/en-US/firefox/addon/multi-account...
The fact that you can't sync container configuration between devices is also a huge pain point, when you have a nontrivial setup.
I still use them, but I accept that I'm going to endure some pain now and then; I can't recommend Firefox containers to people who just want to get work done right now.
Still need user switching although, because sometimes I want to separate multiple google/twitter/etc accounts for example and still want the automatic url-based container activation.
If brave implemented containers although, I would probably use it because chrome works better than FF.
I don't know how MacOS works, but if you set your Firefox shortcut to firefox -P you can switch profiles by restarting Firefox. Granted, it's not as nice as Chrome, but it might still be of worth to you in some way.
You have to double click on your special shortcut with the command line option, and if some other program tries to open a url with firefox as the default browser with the -no-remote / -P command, then it will just not work if you have all users open.
While with chrome it's 2 clicks away and no edge cases making other apps opening urls not work.