Need to know specific statistics about your tabs? Tab Data will provide you with tab related statistics and data. I could see this being helpful for counting webpages, bookmarks or even being helpful for other add-on authors.
A no-clutter image viewer for Firefox that allows you to zoom, rotate and display images/videos against a custom background.
Seen the Recommendation Box? It is the smartest way to buy online. Discover the best discounts while you are surfing on your favorite sites.
Need to tweet something on Twitter that you found on Facebook? Twobble adds a little Tweet option beside the share link for each Facebook news article.
A fast TTS (Text to Speech) screen reader with automatic language recognition with support for English, Spanish and Italian synthesis.
Sniply lets you embed your own call-to-actions into anybody’s website. Embed custom messages into articles from Forbes, TechCrunch, Mashable, BuzzFeed, anywhere. Sniply allows you to drive conversion through content marketing with anybody’s content.
This fantastic add-on plays all videos on YouTube without flash in your preferred size using only HTML5.
X-notifier (aka WebMail Notifier) checks your webmail accounts and notifies the number of unread emails. You can use multiple accounts in a same host.
Torrent Tornado is a unique and one of a kind BitTorrent client for Firefox and SeaMonkey that allows users to download Torrents directly from their browser without any additional software.
Need Settings Buttons? You might want this add-on or you might not. It will add toolbar buttons for the dialog boxes found in the options/preferences menu.