Changes in Thunderbird 85

addressBooks & contacts

The addressBooks and contacts APIs will now return read-only address books. Add-ons that may update contacts and address books should check the readOnly flag of AddressBookNode.

accounts

  • The composeHtml property has been added to the MailIdentity type, to indicate, if the identity uses HTML as the default compose format.

    This change has been backported to Thunderbird 78.7.0.

  • The getDefaultIdentity(accountId) function has been added, to get the default identity of a given account. Use getDefault([includeFolders]) to get the default account.

    This change has been backported to Thunderbird 78.7.0.

compose

  • The begin* functions now honor body, plainTextBody and isPlaintext as compose format selectors, overriding the default compose format of the used/default identity. The accounts API can be used to get the used/default identity and its default compose format.

    This change has been backported to Thunderbird 78.7.0.

messages

Bugzilla list of fixed WebExtension API defects in Thunderbird 85.