To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!Close
Welcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.Close
Define this.. initial.rev142.1-signed.1-signed No Restart
Provides definitions of English words by simply highlighting, right clicking and selecting the 'Define this..' menu option
About this Add-on
To use just highlight the word or phrase that you need to define, right click your selection and choose the "Define this.." option from the context menu.