Gina Trapani, of Lifehacker, has released an updated version of her popular Gmail customization addon, Better Gmail 2. This addon is a combination of dozens of Greasemonkey scripts and with this, you can tweak the heck out of the new Gmail interface. This add-on is one of my personal favourites.

The latest version, Better Gmail 2 0.4 now supports HTML signatures, Firefox 3 compatibility, Gmail Redesigned skin, and many other small fixes. After you install this add-on, you can enable what ever features you want in Gmail from the Firefox Tools menu and all you have to do is refresh your Gmail window for the changes to take effect.

Download

This must-have add-on can be downloaded from here.