Customize shortcut keys; Assign any Javascript code or browser actions to any key strokes.

A clever extension that provides a high degree of 'NoScript' like control of javascript, iframes, and plugins on Google Chrome.

ExtensionFM is a browser extension for Chrome that finds every MP3 file on pages you visit and automatically creates a library of those songs for you to enjoy

"Zotero [zoh-TAIR-oh] is a free, easy-to-use tool to help you collect, organize, cite, and share your research sources. It lives right where you do your work—in the web browser itself."