- Mar 15, 2011
- 13,070
What is Adblock Plus? What can it do?
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. A filter subscription can be added later as well (see Choosing a filter subscription), but you can also create your own filters regardless of whether you use a filter subscription.
Blocking requests is limited to removing advertisements that are technically not part of the web page but downloaded separately. Because of that limitation, there is also an additional mechanism called "element hiding" which allows hiding parts of web pages based on some unique properties. The disadvantage here is that even hidden elements are still downloaded and require processing time in the browser. Also, creating element hiding rules is more complicated because you have to select the right set of properties — only the elements that need to be hidden should have those, not the required page content. Element Hiding Helper extension makes this task easier, yet creating good element hiding rules still requires much experimenting.
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