Difft is a toolbar and website that lets users make changes to web pages and share those changes with the world. Diff supports moderation to make sure only the best changes are shared for web sites. Difft supports official feeds for website owners to deliver their own custom ‘official’ feeds.Here are some key features of "difft":

Ссылка: https://addons...US/firefox/downloads/file/43855/difft.com_toolbar-0.7.7-fx.xpi