Combine Firefox's Location-bar and Search-bar with Omnibar
Here's a nice addon to boost your productivity while searching the web. Called Omnibar, this addon combines your Firefox location bar(address bar) and search bar into one. So you get one really long address bar that also does web searches.
Here are some basic tips -
1. To search for something in Yahoo type the following in the address bar
@y [your search keywords]
Note: You can exclude those square brackets.
2. To search using both Google and Yahoo i.e multiple searches, type
So if you want to search for "digital camers" on both the engines, just type
@g,y digital cameras.
Omnibar also supports shortcuts to other sites; ama for amazon, w = wikipedia, a= answers.com. Suggestions are also provided. Enjoy!