A very convenient extension for those who can open up to 100 tabs in just one day (as I often do). It could be improved (by adding more sounds, for instance), but if Rudy created it for his son, he probably knows better what needs to be improved.

The only thing that bothers me is the icon, which is yellow and tends to fade with the white colors if you use a light interface on Firefox. It would be great if choosing the icon among other ones was an option or, even better, importing our custom icon.