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GreaseMonkey

http://wiki.greasespot.net/

Support and information both for end users and for script authors.

http://userscripts.org/

A general purpose user script site for all browsers, with tens-of-thousands of scripts and an active community.

And there a few especially useful wiki pages you might want to read:

• The Greasemonkey Manual.
• The Troubleshooting (Users) page, in case you ever have problems.