StumbleUpon is the easiest way to discover new and interesting photos, videos, web pages and more, recommended by a community of experts. Tell us what you are interested in and we recommend page after page of amazing stuff you’d never expect to see.
Shareaholic is the easiest way to share interesting webpages using Facebook, Twitter, Email, Google Mail, Reader, Bookmarks, Buzz, Evernote, Bitly, and more... from one simple all-in-one add-on. This is the ultimate tool for the link sharing addict!
The Digg Extension for Firefox allows you to interact with Digg (http://www.digg.com) and see information about the web page you are currently viewing while you use Firefox.
Display the Google PageRank, Alexa rank, Compete ranking and SEOmoz Linkscape mozRank anywhere in your browser, along with fast keyword density analyser, keyword/nofollow highlighting, backward/related links, canonical links, WHOIS, robots and more.
ScribeFire Classic is a blog editor that integrates with Firefox and lets you easily post to your blog.
ScribeFire Classic is no longer supported; you should install ScribeFire Next: https://addons.mozilla.org/en-US/firefox/addon/scribefire-next
Increase your pageviews and improve your blog posts with related posts, images and links!