Update for Thunderbird 68

Required steps to update add-ons for Thunderbird 68.

Technically, legacy bootstrap extensions and legacy overlay extensions need to be converted to modern WebExtensions, but by activating the legacy mode, their general structure does not need to be changed. Such extensions are called legacy WebExtensions.

Required Changes

There are two types of changes which are required to make your legacy extensions compatible with Thunderbird 68:

  • The legacy extension must be converted to a legacy WebExtension by replacing the old install.rdf by a manifest.json.

Convert legacy overlay extension to legacy WebExtensionConvert legacy bootstrapped extension to legacy WebExtension
  • All legacy extensions need to be updated to reflect changes in Thunderbird core, like renamed/replaced API calls, removed support for some XUL elements (need to use HTML elements now) and much more.

Adapt to Changes in Thunderbird 61-68

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