Used this to block new ads in Yahoo mail. Worked better than AdBlockPlus.

ohne uBlock (oder früher noch ABP) kann man doch gar nicht mehr surfen heutzutage... Danke für diese Bereicherung fürs Leben :)

uBlock origin is the best ad-blocker extension for Firefox- it just works! I can browse without having to pay for vulgar and obnoxious ads on screen. And it also help pages load faster than before.

Very Useful!
I can even block Facebook's (People you may know) and other annoying banners