Firefox’s address bar is almost perfect, but sometimes we would like it to do more: for example, if I want to search something on Ebay I have to type “Google item“, then browse the Google’s search page and find a page from Ebay.

Quick Search is a Firefox add-on that enhances the address bar’s functionality, as well as adds search options to the right click menu, allowing you to easily make researches on Google, Amazon, Bing and Yahoo.
Let’s see how it works:
Address Bar Features
After the extension has been installed, you will be now able to search on various search engines just by typing a letter before the search query:
- g keyword: Google search for the query “keyword”
- b keyword: Bing search for the query “keyword”
- e keyword: Ebay search for the query “keyword”
- y keyword: Yahoo search for the query “keyword”
- t keyword: Twitter search for the query “keyword”
Right Click Features
In addition to what we just saw, Quick Search has also another feature: when you select a portion of text and right click on it, you will see four new voices in the menu. These will just allow you to research that text directly in Google, Bing, Yahoo or Amazon, without having to type anything more.
This is a very useful plugin if you make high use of search engines, and you change between them for better results.
Installation Page: https://addons.mozilla.org/en-US/firefox/addon/14448
Photo Credit: Jay Simmons

You really don’t need thouthand off search engines. Google is pretty enough, wan’t go get close results – just search on close website like with “Current Site Search” addon