What's new?
The latest developments for Add-On developers.
Support for MV3
In Thunderbird 110 we have enabled support for Manifest V3 event pages and the new action API (formaly known as browserAction). The current state is not final and we will introduce more API changes before the release of Thunderbird Supernova in summer 2023.
Updated sample extensions to MV3
We updated our sample extensions to be compatible with MV3. Each extension includes comments to highlight the required changes.