Source: https://www.reddit.com/r/firefox/comments/li2lqg/now_that_mozilla_killed_the_ssb_feature_what/
- Open URL:
about:profiles
and create a new profile, let's name itssb_prof
- In a terminal (or Win+R on windows) run
firefox --no-remote -P ssb_prof
- Open URL:
about:support
and a. Make sure thatProfile Folder
ends with.ssb_prof