I used the update to the latest Firefox offered when I opened my current version of Firefox. The download was uneventful. Then I tried to use the "new improved version of Firefox". When I tried to search for something my Google was overridden and Web Crawler took over. I could not remove any reference to Web Crawler and have the new version work. I finally ended up deleting Firefox completely and reloading from a thumb drive. Everything is good again, but I would like to upgrade if there is a way to avoid Web Crawler. Thank you for any help you may be able to provide.