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Firefox's Profiles get a huge upgrade with easier Profile Creation, Switching and Customization
(windowsreport.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Bullshit. I've been multiboxing Firefox for years.
You need to run
firefox.exe -p
to open profile manager and then create all the profiles you want. Then create shortcuts to each new profile.firefox.exe -p ProfileName
This allows you to run a personal profile, work profile and porn profile simultaneously without crossing streams.
Under Linux you can also start a throwaway profile by running
firefox -P $(mktemp -d)
(note the capital P for path)