Changes in Thunderbird 102
Added support for
Added saveMessage(tabId, [options]) and changed the return value of sendMessage(tabId, [options]) from a boolean to a complex object with information about the sent message and its local copies - both functions return a Promise which resolves once the message operation has finished
Subfolders are now being returned in the order used in Thunderbird’s folder pane.
Added open(openProperties) to open messages in tabs or windows.
Bugzilla list of fixed WebExtension API defects in Thunderbird 102.