I have been using this for many years, and trust the developers to keep up with (if not ahead of) the ways advertisers try to sneak in pop-ups, videos, etc . It is far superior than all the paid anti-mal/spy/ad-ware programs I've used when it comes to avoiding unwanted ads. I still use a good antivirus and spyware program, but I will always keep this add-on for as long as it continues to be available with my Firefox browser.
