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Enhances YouTube with Greasemonkey user scripts, that offer options like the FlowPlayer "doesn't start till you hit play" viewer, clean "theater" view, and links to download the video automatically

Enhance Flickr with a compilation of useful Greasemonkey scripts.

Permite personalizar la apariencia de las páginas y la interfaz de usuario

Stylish es a CSS lo que Greasemonkey es a Javascript

Guía del usuario: http://userstyles.org/stylish/help