You use the -P command-line option to switch between firefox profiles. So if the default is named "default", you would use a command of "firefox -P default". I recommend making icons as I described in the relevant thread.
I've got a question and maybe you can help? I've created a profile according to your suggestions at http://ubuntuforums.org/showthread.p...&highlight=TOR and...now I'd like to use my old "default" profile (where I have all my bookmarks, etc), but don't know how to bring it back...what shall I do?