thunderbird-extension
Installation
SKILL.md
Thunderbird MailExtension Development
Complete reference for building, testing, and publishing email extensions for Mozilla Thunderbird.
Overview
Thunderbird extensions use the MailExtension API (based on WebExtensions) with the messenger.* namespace. Thunderbird supports both Manifest V2 and V3 since version 128.
Key Characteristics:
- Global namespace:
messenger(Thunderbird-specific) +browser(standard WebExtensions) - Both MV2 and MV3 supported (Thunderbird 128+)
- Thunderbird-specific APIs:
accounts,addressBooks,compose,folders,mailTabs,messages,messageDisplay - Submission via ATN (addons.thunderbird.net)