I do not know if you have fixed it yet Rob, but I had the same problem over the last few days, a download I made changed my "New Tab" on firefox to a different search bar! not AVG, but the problem was the same. I have managed to fix it, so maybe this will put yours back to normal too... Open firefox, asuming this takes you to the firefox homepage, type about:config in the searh bar, it will pop up and ask if your sure, click the "i'll be carful I promise" button to proceed. You can either scroll down the list and find the following settings, or just type them exactly as I have here, into the search box: You then right click on these settings and click "reset" browser.search.defaultenginename keyword.URL If this does not work, open the about:config again, and scroll down to find all the AVG entries, if any say "search engine", "search results", "extensions." or similar reset these also. Anything that says "user set" you can reset without damaging firefox. You can also use the "manage search engines" option as discussed earlier in the thread, and go ahead and "remove" all of the search engines except Google.