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http://support.mozilla.org/en-US/kb/Private-Browsing
How do I always start Firefox in Private Browsing?
How do I always start Firefox in Private Browsing?
There is a setting in the Preferences window that automatically enables Private Browsing whenever you start Firefox.
If you enter Private Browsing this way, the Firefox title bar won’t say (Private Browsing) but Firefox will still not retain history as described above.
Code:
At the top of the Firefox window, click on the Edit menu and select Preferences
Select the Privacy panel.
Set Firefox will: to Use custom settings for history. Custom History - Linux
Check the box next to Always use private browsing mode.
Click Close to close the Preferences window
firefox %U --private