Profiles for the typical Work/Personal separation with their own bookmarks, extensions, password manager accounts etc……

Then I use containers for isolating sensitive accounts within those profiles (bank, work Google Drive, etc).

I also use temporary containers to make it easier to be logged into the same site with multiple accounts at the same time between tabs - like admin and user accounts for our company’s app - which also make it easier to clear sessions and data.

https://addons.mozilla.org/en-US/firefox/addon/temporary-con...