To turn on private Browsing with Firefox:

Fire Fox Browser

Enter into Tools Menu, click on Private Browsing. 

Fire Fox Click OK

Now, Firefox will alert you to Start Private Browsing.  Click on the box if you don't want to see this message again.  Click Start Private Browsing. You are now in private browsing mode.   To turn off Private Browsing Mode, go back into tools and click on Stop Private Browsing.

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