Adblock Plus

Excelente extension de firefox con la cual puedes bloquear los molestos banners q salen en la pginas web.

aqui una breve explicacion en ingles.

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. Or click Adblock Plus icon in the toolbar to see all elements of the page and block the banners. You can use filters with wildcards or even regular expressions to block complete banner factories.

Related extensions:
* Element Hiding Helper - https://addons.mozilla.org/firefox/4364/
* Filter Uploader - https://addons.mozilla.org/firefox/4042/

Works with:
Firefox 1.5 - 3.0a3 ALL
SeaMonkey 1.0 - 1.5a ALL
Thunderbird 1.5 - 3.0a1 ALL

puedes descargar esta extension desde Aquí