It works as described, simple and useful Puntuado con 5 de 5 estrellas

I have only one request.
When event happens and alert box captures it and issues an alert the user can drink cofe and don't see it.
It is highly recommended to change the ball color if there are some unreaded events.
Some additional note. I use Firefox version 16 and the newest AlertBox version isn't available for FF 16. Is it possible to make upgrade (if you intend to do), that is available also for FF 16. By some reason I don't want to use the latest FF versions - they don't fit my needs.
Thank you

Esta valoración es de una versión anterior del complemento ( 

Thats a great feedback. Changing the color in the toolbar makes sense. About versions, there were API changes in Firefox that AlertBox had to support. Will explore options to support older versions. Thanks.