Welcome to Thunderbird Add-ons.
Add extra features and styles to make Thunderbird your own.Close
Collections by Name
Spruce up your Thunderbird.
there are: AdBlock Plus, Thunderbrowser (Inside a browser thunderbrid),
A must have collection,
Check the first List (https://addons.mozilla.org/en-US/thunderbird/collection/tng) and a few more useful add-ons. Each of these work with thunderbird 3.0 and are some of the best options.