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    • Introduction
    • What's new?
      • Manifest Version 3
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  1. Add-on Development

What's new?

The latest developments for Add-On developers.

PreviousIntroductionNextManifest Version 3

Last updated 6 months ago

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Modernized update guides and Experiment examples

With the experience of the last few years, we have 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 for more details.

Support for Manifest Version 3

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

Updated sample extensions to Manifest Version 3

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

revised our guides for converting legacy extensions
example
Manifest V3
WebExtension API documentation
sample extensions