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Check out https://wiki.mozilla.org/Security/Contextual_Identity_Project/Containers#What_is_.28and_isn.27t.29_separated_between_Containers https://wiki.mozilla.o

• jqs79 9y ago
  Thanks. So it appears that most of it is separated, with the exception of web history and search and form data (which can be identifying). This was also interesting: "Users can log into multiple accounts on the same site, even when the site does not natively support concurrent sessions. ... Current solutions: Users open multiple browsers (this takes users away from Firefox). A user opens one account in Private Browsing mode (this has a limit of 2 accounts, and forces one to be ephemeral)." There is no mention here of the -no-remote flag which has been available for many years.
  • 482794793792894 9y ago
    Well, the vast majority of users have no idea of the -no-remote or -new-instance flags, let alone of Firefox profiles.