delicious.com (previously del.icio.us) encrypted bookmarks creates bookmarks which are private even from delicious by encrypting them using blowfish encryption

Gets rid of almost every google tracking device including tracking cookies without killing your preferences.

Automatically clear your Facebook mini-feed. WARNING: THIS IRREVERSIBLY DELETES ALL ITEMS IN YOUR FACEBOOK MINI-FEED.

Clean your Google Search cookies

Nicer look, SSL + GET for increased security and usability. <b>(now with before & after screenshots!)</b>

Stop Reddit from tracking which links you click

This script just removes redirections on Yahoo! Search links. Now you can :

Removes click tracker redirect from orkut search links

Avoid appearing in profile recent visitors from someone because of accidental clicks. This script displays a confirmation box when clicking on a orkut profile link.

Rewrites Google News links to go directly to the news story without being redirected and tracked by Google (for privacy and performance reasons).

Allow/Deny pages from referrencing Chrome files

Pre-fill 'email' fields with user+domain@yourdoma.in addresses

Clear the ping attribute on an HTML anchor

Allows in situ settings of permissions and licensing on the flickr photo stream page without needing to jump to a new page.

surf the web anonymously

Offers to rewrite links with URL arguments pointing elsewhere, to elsewhere, without the link bounce indirection. (I e http://redirect.to/?url=http://www.google.com/ becomes a direct link to http://www.google.com/)

Pre-fill a fake email address on WordPress / MT / TypePad comment forms