Changes in Thunderbird 90

cloudFile

• added support for the browser_style manifest property to the cloudFile API

compose

• added sendMessage(tabId, [options]) function

• added getComposeState(tabId) function

• added onComposeStateChanged event

• added ComposeState type

• added redirect enum to type property of ComposeDetails

messages

• added size property to the MessageHeader

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Bugzilla list of fixed WebExtension API defects in Thunderbird 90.