Group items matching

in title, tags, annotations or url

allows you to keep up with all of your Twitter conversations right from your browser sidebar.

Send messages, receive messages, share links, and more

Weave Sync

Firefox experience across multiple browsers

continuous synchronization of your bookmarks, browsing history, saved passwords and tabs

Add useful extra features to Gmail, like hierarchical labels, an unread message icon on your browser tab, file attachment icons, and more.

Shareaholic is a lightweight and easy to use add-on for Firefox with a minimal browser footprint. Shareaholic makes it very simple to quickly, and very easily share, bookmark, and e-mail any web page via a wide array of your favorite web 2.0 social networking, bookmarking, blogging, and e-mail services.

A sample of supported services: * Amazon Wishlist, AttentionMeter * Bit.ly, Blogspot, Blogger, Buzzster!, BzzAgent Bzzscapes * Connotea * Delicious, Diigo, Diigolet, Digg, DiggBar * Evernote * Foxiewire, Friendfeed, Followup.cc * Google Bookmarks, Google Notebook, Google Reader, Google Gmail * Healthranker, Hub.tm * Identi.ca, Instapaper, Is.gd * Kaboodle * LinkedIn, Windows Live, Hotmail, LiveJournal * Meneame, Mixx, MySpace, Mozillaca * Netvibes * Plurk, Posterous, Ping.fm * Reddit * Simpy, Soup.io, Sphinn, Stumbleupon, Streakr, Smaknews, Smush.it, Su.pr * Techmeme Tips, Tipjoy, TinyURL, Tipd, Tr.im, Truemors, Tumblr, Twine, Twitter, Twitthat, Tweetie, TBuzz * Vi.sualize.us * Weheartit, Wordpress * Yahoo Buzz, Y Combinator YC Hacker News

Shareaholic also alerts you to how popular the page you're on based the number of times the web page has been dugg and saved to delicious.

After installing Personal Menu, "Menus Toolbar" is available in Toolbar Context Menu, and you may hide it to save the space of browser

allows you to download the audio from almost any video on the internet.

Download links are found at the bottom right of the browser window when on a page which has a video.