Workona - A better way to work in the browser.
Tweetflick - Save, organize & find Tweets to get the most out of Twitter
OneTab - Whenever you find yourself with too many tabs, click the OneTab icon to convert all of your tabs into a list. When you need to access the tabs again, you can either restore them individually or all at once.
Twitter Bookmarks - Create shortcuts to your favorite users/tweets on Twitter
Session Buddy - Manage Your Browser Sessions
My Twitter Bookmarks - Easily categorize your twitter bookmarks to be read later