I access the Internet using my Laptop from work, home and at many clients sites. I always adjusting FireFox proxy settings to match my current location settings. I want to have an end to this repetitive task. I found that FireFox can have multiple profiles feature. So I can have profile for “Home” with direct connection to the Internet and “Work” configured for the work proxy and so on.

I found the solution at:
http://www.mozilla.org/support/firefox/profile

I just added –ProfileManager switch after the FireFox exe name. When I start FireFox you I see the following dialog.

So you can manage as much profiles as you want.