Chrome/Firefox/Opera/Safari: Whether you're searching for videos, images or torrents on the net, sometimes the first search engine you try doesn't give the best results. Try This Search On lets quickly run your search terms through a number of similar engines.
If you're looking for something a bit more obscure, you often have to try a few different search engines before you find it. This is especially true if you're looking for a specific type of file — like a video, music or a torrent. If you don't find what you're looking for on the first try, the Try This Search On user script will let you run those same search terms through other popular search engines with the same niche.
So, say you search for a video on YouTube but don't find what you're looking for. Try This Search On will provide links to searching for the same thing on Vimeo, DailyMotion, Google Video and other video search engines. A search on The Pirate Bay will let you send your search terms to BTJunkie, Demonoid, Mininova, and others. By clicking the question mark button on the Try This Search On bar, you can even add custom search engines yourself (or remove ones that come with it). It's a nice way to save a bit of time on the more obscure searches, saving you from manually navigating to other sites and re-typing search terms. All it takes is a few clicks to search multiple sites at once.
Try This Search On works with Chrome, Firefox with Greasemonkey, Opera and Safari with Greasekit. Note that if you want to use it on Google, you'll have to turn off Google Instant.