What are Smart Keywords?
Smart Keywords are an easy way to search websites right from the Location bar. Say you visit The Internet Movie Database (IMDB) all the time to look up things. You go to imdb.com and click in the search box and enter whatever you're searching for, and click Search. Lots of clicking, lots of steps.
With an IMDB Smart Keyword, you can type imdb Rachel Bilson into Firefox's Location bar and hit enter and be taken right to the result.
Creating a Smart Keyword
Visit the page that has the search field that you search with. 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.
"IMDB Search" and create a keyword e.g. "imdb" and file the Bookmark somewhere.
Firefox comes with a Quick Searches folder so you could use that. Click OK
Now enter imdb Matchstick Men into the Location bar and press Enter. You're done! You can repeat these steps for any searches you use - e.g. Amazon, your corporate phonebook, your favorite bittorrent site, anything!