I have found this to be one of the most useful FireFox extensions I have installed, and I believe it will come of great use to many of you. Instead of always having to go to Dictionary.com for definitions, you could install this extension and just double click on the word you don’t know the meaning of. Go download this extension and start expanding your vocabulary today!

Link: www.download.com/3000-2242_4-10470764.html?tag=img