"The Web Developer extension adds various web developer tools to a browser. The extension is available for Firefox and Chrome, and will run on any platform that these browsers support including Windows, Mac OS X and Linux."

snipe

"Snipe is a Safari and Chrome extension that allows you to quickly sift through the sea of open tabs you accumulate throughout the day. Simply invoke the keyboard shortcut and up pops a Quicksilver-like input field allowing you to search through your open tabs and select one, without ever leaving your keyboard."

ADC Search is an extension for Safari that lets you search directly on the Apple Developer website.

When searching in Google for Apple framework keywords, results from the ADC (Apple Developer Central) website are usually buried.This extension provides search results directly from the ADC website.

"a Safari Extension that allows you to listen to your the music in your Dashboard, iTunes style."

yesss!

safari 5 extension

NoScript

Fast Dial replaces blank tabs with a panel of thumbnails of your favorite sites.

Object-based Password (ObPwd) prototypes