When installed this add-on will colorize your tabs depending on the protocol they use (currently [http/https red/green respectively] only). So you would know if you are browsing through a secured connection even if you have hidden the navigation bar.
Have you seen Tab Set Saver? It lets you save a set of tabs into a single HTML file (thumbnails included), and restore one or all of the tabs from this file at a later time.
With More in Content UI + you can view interface in tabs (or sidebar) rather than floating window. It means that you can change default behavior of commands in Firefox and add-ons (menu items, toolbar button, etc.) from opening an interface in window to opening it in sidebar or tab.
This add-on shows now playing notifications for soundcloud and bandcamp and allows you to scrobble songs to Last.fm, love/unlove them, and search current artist or track using a shortcut in google. Fully customizable via preferences.
Clip and save any part of any webpage to your CoKnown projects. Drag & drop and resize clippings however you like on Pinboards. Keep things tidy with Project Tabs. Toggle to List view for notes and more. Collaborate with friends. Available everywhere.
When shopping online, the Which? Shopping Toolbar will automatically recognize the product you are looking at and how much it costs. Within seconds the toolbar will appear with the cheaper price and a direct link to the Which? review, if available.
Search Cloudlet inserts smart tag clouds into Google / Yahoo / Twitter interface to help you search faster. This free productivity-boosting add-on was featured at LifeHacker, PC World, Website Magazine, etc. Install it now to add magic to your search.
This is a light-weight, secure add-on that allows you to quickly see your Netflix movie ratings right in the main page without having to hover over any movie images. Super nifty if you want to see your movie ratings quickly.
Searchonymous helps to prevent your Google searches from tracking by Google or the NSA. When installed no tracking cookies are sent to Google while searching. This is done by blocking certain Google cookies (such as the PREF-ID) or generating randomized ones (which are worthless for tracking).
Changes the selected search engine in the search bar by scrolling the mouse over the search bar or search context menu. Also supports keyboard shortcuts ctrl+k and ctrl+shift+k to change the search engine with the keyboard.