Welcome to Thunderbird Add-ons.
Add extra features and styles to make Thunderbird your own.Close
Rated 4 out of 5 stars
Works well. This is available on Firefox 3.5 completely! (Yes, I installed this by ingoring version check.)
If you're an author of addons, you should see the code. It's very smart and simple, so this works on many versions of Firefox including trunk.