The Office Options add-on for Firefox and Thunderbird provides access to change the appearance of the Office Black theme through subskins.
How to Install in Thunderbird:
1. Right-click the link below and choose "Save Link As..." to download and save the file to your hard disk.
2. In Mozilla Thunderbird, open Add-ons from the Tools menu.
3. Click the Install button, and locate/select the file you downloaded and click "OK".
· Mozilla Thunderbird
What's New in This Release: [ read full changelog ]
· Added support for a solid toolbar background colour.