What's new? | Thunderbird

Modernized update guides and Experiment examples

With the experience of the last few years, we have revised our guides for converting legacy extensions to WebExtensions. The information is now more compact and the examples have also been made clearer.

Introducing the menu typed action button

Since Thunderbird 115, all our action buttons can be defined as menus:

See our example for more details.

Support for Manifest Version 3

Thunderbird 128 ESR is the first Thunderbird release to officially support Manifest V3. The required changes to convert a Manifest V2 extension to Manifest V3 are listed in our WebExtension API documentation.

Updated sample extensions to Manifest Version 3

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