The most useful Firefox extension for Google is Customize Google. It lets you remove websites from Google Search results, search other places from Google, disables click tracking if you have privacy concerns and much more.
Firefox has a Clean Private Data feature that clears all your web surfing tracks - everything including cookies, cache, temporary files, web addresses and stored passwords are deleted from the computer.
Mozilla Firefox is lean and fast but what makes this browser all the more useful than Internet Explorer are the free extensions or plugins created by the Firefox developer community. Here are some of the best and extemely useful Firefox extension.