Yes, best feature ever. I've been giving it a try for some time now since it came out in test pilot and it's beautiful.
Open your google/twitter/whatever accounts in separate profiles, et you get the benefits of being "always logged in" with no tracking on your main session.
Having multiple github accounts next to each others is a bliss and prevent so many stupid mistakes I used to make, like commenting with the wrong identity on a PR.
Combined with the tab group extension, it makes currently Firefox the most productive browser experience I had in years.
If you enable 'privacy.resistFingerprinting' in your about:config, you get substantially harder to track. The caveat is that there's a small (albeit noticeable) performance delta.
Open your google/twitter/whatever accounts in separate profiles, et you get the benefits of being "always logged in" with no tracking on your main session.
Having multiple github accounts next to each others is a bliss and prevent so many stupid mistakes I used to make, like commenting with the wrong identity on a PR.
Combined with the tab group extension, it makes currently Firefox the most productive browser experience I had in years.