Well, here's a little video from Tekzilla explaining how to set them up much more easily.
In case that's not clear, the trick is ... on any site that has a search field, right click on the text box where you would normally enter the search string and choose "Add a keyword for this search". Then, just choose a keyword for it and save the bookmark.
You can then use that keyword as a prefix in the URL entry field at the top of your browser.
So, for example, if you've set up "d" as a keyword to search dictionary.com you could enter "d steatopygous" to decipher my cryptic blog name.