Adblock Plus is an extension for Firefox, Thunderbird, and several other applications with the primary goal of removing advertisements. For that, it will look at all requests made by web pages and block the request if the address the request should go to matches a filter in Adblock Plus. Out of the box, Adblock Plus comes without any filters whatsoever but will offer to add a filter subscription on first start — that is a list of filters maintained by other Adblock Plus users and will be updated automatically regularly.
Install Adblock Plus in firefox from here
Adblock Plus in Action Video