Has potential for people who need this functionality Puntuado con 3 de 5 estrellas
[Note: I was not a user of this extension. This review was submitted to provide examples to the AMO editors of how I would review addons.]
Mostly works on WinXP (Firefox 3.2pre1), but doesn't work well at all on Linux (Ubuntu 8.04, Firefox 3.0.5). With a bit more work it may become useful for more people.