Update for Thunderbird 78
Required steps to update add-ons for Thunderbird 78.
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Required steps to update add-ons for Thunderbird 78.
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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
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.