It is called Adblock plus or ABP it works great.

It will ask you to subscribe, but you don't pay anything. Basically what you are doing is picking your language.
Describtion from the page........
Ever been annoyed by all those ads and banners on the internet that often take longer to download than everything else on the page? Install Adblock Plus now and get rid of them.
Right-click on a banner and choose "Adblock" from the context menu - the banner won't be downloaded again. Maybe even replace parts of the banner address with star symbols to block similar banners as well. Or you select a filter subscription when Adblock Plus starts up the first time, then even this simple task will usually be unnecessary: the filter subscription will block most advertisements fully automatically.
Related extensions:
* Element Hiding Helper -
http://addons.mozilla.org/en-US/firefox/addon/4364* Filter Uploader -
http://addons.mozilla.org/en-US/firefox/addon/4042Works with:
* Firefox Firefox: 1.5 – 3.0a5
Download page, AdBlock plusI give this a 5 smilie rating.

I've been using it for a few days, and like it............

I've been using the ABP for some time now and have really liked it. I was using FiltersetG with it and I didn't like that. It really slowed down my browser. I tried the ones that you have listed and they were ok. I saw a new set of Filter Subscriptions called EasyList Filter. This three set of filters come highly recommended by ABP as being the most compatible with them.
There is Easylist which is the main add blocking subscription. Then there is EasyElement which is the secondary subscription for removing text ads & leftover spaces" and ABP Tracking Filter "the optional subscription for stats & analysis blocking".
Since adding these three to ABP my browser has been a whole lot faster and all those annoying flash adds are gone that was getting missed by the others.
Another great free add-on for Firefox.
http://easylist.adblockplus.org/