How do I... Use add-ons and extensions in Mozilla Thunderbird?
Source: Nicole Bremer Nash
Add-ons and extensions can greatly enhance the already feature-rich Mozilla Thunderbird. Whether you need to do business in a foreign language or just want to customize a color scheme, there is likely to be a Thunderbird add-on or extension that can make it happen. Nicole Bremer Nash explains how Thunderbird add-ons and extensions work, how to find them, and how to install them.
This download is also available as an entry in the TechRepublic How do I... blog.