Changelog for Thunderbird 83

The following WebExtension API changes were introduced in Thunderbird 83.

api compose

• type ComposeAttachment.size — The size in bytes of this attachment. Read-only.

api menus

• type OnClickData.attachments — The selected attachments. The :permission:`compose` permission is required to return attachments of a message being composed. The :permission:`messagesRead` permission is required to return attachments of displayed messages.