Rated 3 out of 5 stars

Nice initiative, but seems rather clumsy compared to 'Stealther', another privacy extension.

This review is for a previous version of the add-on (1.5). 

Huh?

This extension toggles Firefox's built in private browsing mode. Read http://ehsanakhgari.org/blog/2008-11-04/dont-leave-trace-private-browsing-firefox

Stelther is no longer needed.