Firefox Add-on - Ad Blocker

I have been using the Ad Blocker add-on for Firefox for a few days now and I must say it is one of the more useful ones I use. It allows you to subscribe to a list of sites to be filtered. You can customize that list as you see fit. However, my favorite feature of this add-on is the ability to simply right-click on an "image ad" and block it. This is really handy for me since most of the sites that host their own ads that aren't listed in the filter list provided with the add-on.

https://addons.mozilla.org/en-US/firefox/addon/6826