Best adblocker on the Internet! Although may cause some pages not to load (or partially), may be a sign to stay away from these.

No rules to setup before usage, although if desired, can block (blacklist) sites or allow (whitelist) others. The setting can be found by clicking onto the AdBlocker Ultimate icon.

On a scale of 1-5, a solid 5 Star security extension for any Firefox user to have. There's also installers for other popular browsers, there may be a cost if not natively offered with browser.

EDIT: 2 years after my initial review, everything is still great, highly recommended extension & 100% satisfied!!!