Run different Firefox profiles concurrently?

Solution 1:

You do not need to install multiple versions of Firefox to do this. If you want to have two shortcuts, one which launches the default profile and one which launches a profile named "Research", your two shortcuts should point to:

• [path to firefox]\firefox.exe
• [path to firefox]\firefox.exe -P Research -no-remote

It does not matter which shortcut you launch first.

Opening a new instance of your Mozilla application with another profile:

Never use -no-remote to start the "default" profile (the one that is set to open without asking when you launch Firefox). That's because when you launch Firefox, for example, by clicking a link in your mail program, you will get a "Firefox is already running but is not responding" message if the default profile is already in use. The solution is to always start the default profile normally and launch all others with -no-remote. Then it will work.