I am currently developing an extension which needs to encrypt the body of the email you are writing. I already did the encryption part, but now I need to display a html in the message composer window. I already know how to extract the text with:
var msgComposer = window.gMsgCompose;
var editor = msgComposer.editor;
var text = editor.outputToString('text/plain', editor.eNone);
I haven’t found a way to set the mail body however…