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Source x Ways To Manipulate Websites In Firefox

The Firefox web browser offers an user several ways of manipulating web sites in realtime. The article discusses several of the possibilities that are available ranging from popular Firefox add-ons to userscripts and other means of website manipulation.
We would like to encourage you to post additional tips and hints about website manipulation in the comments of this article so that the page becomes as comprehensive as possible. All methods of manipulating websites have been tested with Firefox 3.5x and 3.0.x. Most will probably also work in previous versions of the web browser.