Anything having to do with search engines and search bar.
TinEye is a reverse image search engine. The plugin adds a context menu item that allows you to search for an image to find out where it came from, how it is being used, if modified versions of the image exist, or to find higher resolution versions.
Integrates location bar and search bar into one. Shows search and url suggestions. Quickly switch search engine using search keywords. Provides different auto-complete popup styles for compact displays.
881 weekly downloads
Expands the context menu's 'Search for' item into a list of installed search engines, allowing you to choose the engine you want to use for each search.
Jump-to-word buttons and highlighting for the search box content
Foobar combines Firefox's search and address bars into one easy-to-use search and navigation bar.
179 weekly downloads
Search the brand new Wolfram|Alpha computational search engine.
Protects against Blackhat spam SEO in search engines (Google, Bing & Yahoo).
Search bar optimized for quicker switching of search engines.
Autosizes the searchbar as you type, cleans the query or reverts to your default search engine after submitting. Supports almost all themes and various search bar related extensions. Useful for saving space on a small screen.
A web discovery and search addon
Surf the web with this sidebar to find up to 300 websites similar to the one you land on.
Immediate access to 200 million sites reccomendations.
Empower your daily Google search session through the Getmore feature.
87 weekly downloads
Find and download anything you want from various file sharing sites like Rapidshare, Megaupload and more.
81 weekly downloads
Torrent Freedom is a torrent search engine which leads directly to torrent detail pages with direct links to torrent files. It searches on more than 10 trackers without registration.