Though Chrome and IE8 are promoting this as an exciting NEW feature, this is something that you could do w/ FF for a while.
If you want to setup an incognito option for FF, simply follow the steps below:
Step 1
Run the following command to start the firefox profile manager.
In Linux, press Alt+F2
In Windows, press Win+R
and type: firefox -ProfileManager (also firefox.exe -P in Windows)
If you get an error like “cannot find command” then use full path to firefox/firefox.exe in linux/Windows respectively.
Step 2
Press “Create Profile” and enter “Incognito” (or a name of your choice) as your new profile name and press “Finish”.
Step 3
Select “Incognito” profile and press “Start Firefox”.
Step 4
Go to Edit->Preferences->Privacy. (Tools->Options->Privacy in FF3)
Select “Always clear my private data when I close Firefox” and unselect “Ask me before clearing private data”.
For additional privacy:
Step 5
That’s it. Setup is done. Now, whenever you want to go undercover,
run the following command: firefox -P Incognito -no-remote
Note 1: You can run incognito mode and normal mode together simultaneously.
Note 2: Its advised that you put the above command in a shortcut for easy/quick access.
Links:
[1] http://pulse.veltsos.com/category/it/software