For anyone wanting to do this, the profile and no-remote command line options[1] may be useful if you want to create shortcuts to launch specific profiles You

For anyone wanting to do this, the profile and no-remote command line options[1] may be useful if you want to create shortcuts to launch specific profiles You might also want to consider using a different theme[2] in each profile to help avoid mixing them up if your running multiple instances simultaneously. My initial use case for this was adding the lets encrypt staging certificate authority to the trusted root certificate authorities in a profile only used for testing. [1] https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options#-ProfileManager_or_-P https://developer.mozilla.org/en-US/docs/Mozilla/Command_Lin... [2] https://addons.mozilla.org/en-US/firefox/themes/ https://addons.mozilla.org/en-US/firefox/themes/