While I was using Google Chrome, I quickly noticed the private browsing mode. Also called incognito mode (incognito means to avoid being recognized).

For times when you want to browse in stealth mode, for example, to plan surprises like gifts or birthdays, Google Chrome offers the incognito browsing mode.

  • Web pages that you open and files downloaded while you are incognito aren’t recorded in your browsing and download histories.
  • All new cookies are deleted after you close the incognito window.

Changes made to your Google Chrome bookmarks and general settings while in incognito mode are always saved. [Google Chrome Help]

It is equally useful to browse pr0n also. ;P

Whatever the use, this is how you can do so in Firefox:

  1. Select Tools > Start Private Browsing. A dialogue box will ask you whether to start private mode; answer in positive
  2. The easiest way is to use the keyboard shortcut: press [Ctrl] + [Shift] + [P]
  3. Key in about:config in the address bar, press “I will be careful, I promise” button in the filter field key in privatebrowsing.autostart; change the value to true. From next restart onward every activity will be in private mode.

Another tip suggested by Firefox facts is to use an extension to do this easily:

Quickly Turn Private Browsing On (or Off)

One tweak or suggestion for this new mode is to give the user a toolbar button to turn it on or off.  The Toggle Private Browsing add-on for Firefox does that.  It gives you the ability to switch between private browsing and regular browsing by adding a button to either the toolbar or status bar.

Hat tip : Incognito with Firefox