Limited Rated 2 out of 5 stars

This extension is ok, but it is far too limited. I prefer to use Advanced URL Builder (https://addons.mozilla.org/en-US/firefox/addon/1399) which can be easily configured to do this search (http://www.google.co.uk/search?q=define%3A)

This review is for a previous version of the add-on (1.2.2).