Thunderbird78+: How to check for message create, reply and forward
问题 I am a beginner in thunderbird addons so I really appreciate if you can help me. I am trying to find a way in my background javascript to check whenever a user has opened the window for create a new message, reply a message and forward a message. I want to put a default text in the message window before the user is gonna send it. I know thunderbird 78+ should only uses web extension APIs and i found this Compose API but how to use it in my background script. https://thunderbird-webextensions