I like it. Puntuado con 5 de 5 estrellas

Looks good (Firefox 9.0.1). Also coordinates well visually with this user style (for Stylish add-on; replaces ugly red tab close buttons and some others with attractive aqua-colored spheres):
http://userstyles.org/styles/2759/tab-close-button-mac-os-x-panther-style-aqua

Esta valoración es de una versión anterior del complemento (1.0). 

Thanks.