Spectacularly brilliant!!! Rated 5 out of 5 stars
This extension is so great that I can't even think of surfing the web without it! Just imagine the wonders it can do for you who have a slow internet connection or pay per megabyte -- just don't download those freaking ads and save your sanity, time and money!! This extension is reason alone to use Firefox!
The only thing that could be improved is the way you manually locate and block stuff that slips through.
To get an even better web experience, I have a tip: Disable animated images that drive you nuts whenever they appear. Just use about:config and set the image.animation_mode value to none. Flashblocker is an extension that also could be of interest.