Great! Rated 5 out of 5 stars
When Stealther is active, Firefox does not make record of your browsing history, thereby saving the time you would spend deleting your tracks on Firefox.
My only complaint is that Stealther sometimes fails to work, and Firefox records my browsing history even while Stealther is active. However, this doesn't happen too often, and I give this extension a 10 for its otherwise excellent performance.