In Firefox when I highlight a text or phrase and right-click it, I noticed there's a sweet menu item called "Search Google for [highlighted text]". Now that I discovered it, I use it all the time for quick Google look-ups on things. But most of the time, I like to use it to look up a definition of a word I don't know.
My question is, how can I edit that menu item (or create a new one) so when I click that menu item, it pre-fills the Google search box with "define: [highlighted text]"? And if not, how can I create a context menu-item so I can look up words on a particular dictionary site?
Thanks for any insight!