Search quickly with Definr and Firefox
Four pretty easy methods, sorted by usefulness.
In Firefox's search box, click the icon with the little arrow. Then, click "Add Definr dictionary search".
Now, just click in the address bar and type d hangover to search for "hangover" on Definr!
In Firefox's address bar, type definr/hangover and press Ctrl+Enter to look up the word "hangover". Firefox will type the "http://" and ".com" parts for you.
Drag this link to your Firefox bookmark toolbar: Look up with Definr