Rated 3 out of 5 stars

to ronib
try this extension

https://addons.mozilla.org/fr/firefox/addon/9931

and i think this one use the same ressource
https://addons.mozilla.org/fr/firefox/addon/11077

you may need to register but it's free

anyway great extension ,but some definitions do not make sense to me
great work anyway

This review is for a previous version of the add-on (1.02).