Firefox Profile Manager
Using one computer at home or at the office? Tired of always having to clear the Firefox’s cache because the other users may find out what your username is or what sites you visited? Then it maybe time to get your own profile in Firefox.
Lifehacker’s Gina Trapani has provided us with the way on how to do it.
To get started setting up your multiple browser users, you’ll start up the Firefox profile manager. To do so, from the command line, run Firefox with the –profilemanager argument.
On the Mac, the command is:
/Applications/Firefox.app/Contents/MacOS/firefox-bin –profilemanager
The first time you run it, Firefox’s profile manager will show only the default profile you’ve been using. There you can create, rename and delete alternate browsing personalities, like say, “work,” “blogging,” or “ball and chain,” as shown.
More details here