Puntuado con 5 de 5 estrellas

This a simple and much needed feature that should be by default in Firefox with some sensible settings to expire cookies after a week or month or so. The extension description should describe how to use this (go to Addons Manager, select options of this extension).

Esta valoración es de una versión anterior del complemento (3.1-signed). 

Okay, fixed the description. Thanks!