REDWOOD CITY, Calif.--(BUSINESS WIRE)--Avast Software, maker of the most trusted mobile and PC security in the world, announced today that Avast’s patent-pending technology, Avast Browser Cleanup, has identified more than 60 million different browser add-ons and removed more than 650 million from users’ browsers in the past two years. While not malicious per se, browser add-ons that come as toolbars can hijack and switch a user’s search preference and can be extremely difficult to remove once i