Firefox – How to create separate profiles for Firefox Developer Edition and Firefox

firefoxfirefox-developer-edition

I need to run Firefox Developer Edition (67.0b3.) and Firefox (regular version) simultaneously, but whenever I try to run the second instance I get this error message:

Firefox is already running, but is not responding. To open a new
window, you must first close the existing Firefox process, or restart
your system.

I remember that when I first installed Firefox Developer Edition, there was an option in the Settings to use separate profiles for Firefox Developer Edition and Firefox. Now I don't see that option in the settings.

How to achieve that profile separation? Maybe it can be done by manually editing profiles.ini?

Best Answer

if you put "about:config" in the URL bar and navigate there, it should open the configuration settings, which includes the profile. (ed:actually looking through it, it may not)

you can also add the flag "kfirstrun" to Firefox command line to force the initial setup

you can also use the following flags: -CreateProfile profile_name (creates a new profile in the default directory, but doesn't start the application)

-CreateProfile "profile_name profile_dir" (creates a new profile in the profile_dir directory, but doesn't start the application)

-ProfileManager (start with profile manager, or -P without a argument)

-P "profile_name" (bypass the profile manager, and start the application with the profile named profile_name. note: case sensitive)