ive been searching for threads about Firefox and i realized a lot of people have something called "AdBlock" so im wondering what it really does and if its any good.
Adblock is THE Firefox extension.
Many people use it to block Ads. I use it to block offensive or annoying avatars/sigs, on various websites. Ones that are very animated, jerky, or have lots of gore.
Edit: POST JUMP!
It's a content blocking extension. Allows to prevent something from ever being displayed again, based on a set of rules involving regular expressions. Unless the current website is in "whitelist" or you disable Adblock or you delete that rule ^^
So it's very useful to block advertisements but not only that (any thing you don't want to see again, such as an avatar you don't like etc... ).
It is found here.
A typical rule would look like *.advertisingsocietydomainname.com/* or */adverts/* ... you can of course set as many rules as you wish.