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Required steps to update add-ons for Thunderbird 78.

Update for Thunderbird 78

{% hint style="info" %} Support for legacy WebExtensions was removed from Thunderbird Beta version 74, released in February 2020. Only modern WebExtensions are now compatible with Thunderbird 78. {% endhint %}

Required Changes

There are two types of changes which are required to make your legacy extensions compatible with Thunderbird 78:

  • The legacy WebExtension must be converted to a modern WebExtension

{% content-ref url="../historical-overview/legacy-to-modern.md" %} legacy-to-modern.md {% endcontent-ref %}

  • All extensions need to be updated to reflect changes in Thunderbird core, like renamed/replaced API calls, removed support for some XUL elements and much more.

{% content-ref url="changes.md" %} changes.md {% endcontent-ref %}

Additional Tips

{% content-ref url="../../resources/tips-and-tricks.md" %} tips-and-tricks.md {% endcontent-ref %}