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 the next Thunderbird ESR in summer 2024.

Updated sample extensions to MV3

We updated our sample extensions to be compatible with MV3. Each extension includes comments to highlight the required changes.