Changes in Thunderbird 81

messageDisplay

• The getDisplayedMessages(tabId) function has been added to allow access to details of multiple-selection of email. Previously only a single selection function was available.

  This change has been backported to Thunderbird 78.4.0.

• The onMessagesDisplayed event has been added.

  This change has been backported to Thunderbird 78.4.0.

See the documentation on those functions and events for more information.

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Bugzilla list of fixed WebExtension API defects in Thunderbird 79, Thunderbird 80 and Thunderbird 81.