Smart Keywords is a pretty nifty feature of Mozilla Firefox. To understand how useful Smart Keywords are, consider this example. I frequently visit Technorati a lot of times to search for blog posts. Using a Smart Keyword I can search Technorati right from the Firefox address bar without the need to go to Technorati.com.
Creating a Smart Keyword
For creating a smart keyword :
- Visit the page that has the search field that you search with.
- Then right click on the search field. Choose Add a Keyword for this Search…
- The Add Bookmark dialog will appear. Give the bookmark a name, e.g. “Search Technorati” and create a keyword for e.g. “technorati” and save the Bookmark.
- Click OK.
Now enter Technorati <yoursearchterm> into the address bar and hit enter. For example if you want to search for “Microsoft” at Technorati.com type Technorati Microsoft and you will see Technorati search results for the term Microsoft.
Repeat the steps above for any website search you want to add. 
Quick Tip : To avoid cluttering your bookmarks, create a separate folder in your bookmarks to store these “Smart Keywords”.
Pallab
6 Jun 07 at 11:00 pm
Opera calls it “Nickname”. The funtionality is exactly the same though.
OpenDNS (www.opendns.com) also allows you to create shortcuts. Using that you can achieve the same thing. The advantage is that opendns is browser independent.
Manas
6 Jun 07 at 11:11 pm
I love OpenDNS … Adds a huge level of functionality to my browser’s address bar.
Nirmal
7 Jun 07 at 4:22 pm
Nice post, will try it out. BTW stumbled.
Manas
7 Jun 07 at 8:14 pm
^^
Ashwin
9 Jun 07 at 7:07 pm
I also use one other cool thing in FX. I give letters to my bookmarks. For Gmail, I have given “g”. When I want to visit Gmail, I simply enter g and hit enter.
Manas
9 Jun 07 at 7:39 pm
Excellent tip