This extension is awesome! Its like 3 extensions merged into one. My only problem with it is that its not open source and not having been reviewed manually by Firefox and given the Recommended tag as it could cause a security risk.
Edit: I don't know why but the Google search option isn't working. When I select it, it just gives me "If you're having trouble accessing Google Search, pleaseclick here, or sendfeedback.".
Edit 2: the error above is fixed but google search brings a captcha every time it opens.