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http://support.mozilla.com/en-us/kb/Profiles
http://support.mozilla.com/en-US/kb/Managing+profiles
Firefox 2 and 3 simultaneously

 

  1. exit firefox
  2. start via firefox.exe -ProfileManager

 

or

 

  1. DO NOT EXIT FIREFOX
  2. start via full/path/to/firefox.exe -profile-manager -no-remote
    1. or maybe even firefox.exe -p -no-remote
    2. the -no-remote enables running multiple instances of the application with different profiles
    3. see also Firefox command-line arguments

 

 

Life Hacker: Mastering Multiple FF Profiles -- see also xrefs in the comments. Some interesting ideas discussed.

 

Still, I can’t see a solution to my main problem with the “don’t ask at startup” checkbox.....

 

 

Profile Folder

The user.js, user.css files (etc.) are in your profile folder. Locating the profile folder on Windows is usually: %AppData%\Mozilla\Firefox\Profiles\xxxxxxxx.default\, where xxxxxxxx is a random string of 8 characters. Just browse to C:\Documents and Settings\[User Name]\Application Data\Mozilla\Firefox\Profiles\ and look around.

 

How to find your profile folder

 

 

I usually create a shortcut named “firefox-profile” in my shortcuts folder; this way -- Windows-R firefox-profile brings the folder right up.