Firefox extensions

• Tweet Context
• Context History (formerly named Tab Session History)
• Paste to Tab and Go
• Shorten URL
• FoxieWire (discontinued)

XML files for Custom Buttons extension

• XML directory / source
• More tools

User scripts for Greasemonkey extensions

• at Google Code
• at userscripts.org
• at developer's home page

Other projects

• User styles for Stylish extension