Changes in Thunderbird 102

compose API

• Added support for additionalFccFolder, attachVCard, deliveryFormat, deliveryStatusNotification, overrideDefaultFcc, overrideDefaultFccFolder, priority and returnReceipt in ComposeDetails.

• Added getActiveDictionaries(tabId), setActiveDictionaries(tabId, activeDictionaries) and onActiveDictionariesChanged

• 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

folders API

• Subfolders are now being returned in the order used in Thunderbird’s folder pane.

messages API

• Added support for headersOnly to MessageHeader.

• Added createTag(key, tag, color), updateTag(key, updateProperties) and deleteTag(key).

messageDisplay API

• Added open(openProperties) to open messages in tabs or windows.

---

Bugzilla list of fixed WebExtension API defects in Thunderbird 102.