我正在构建Thunderbird扩展程序，并希望将自己的标头添加到所有传出电子邮件中(例如<myext-version：1.0>)。任何想法如何做到这一点？我知道这是可能的，因为这是在OpenPGP Enigmail扩展中完成的。谢谢！

解决方案

我不知道答案，只是一些想法...

我认为雷鸟扩展通常只是xul和js。从enigmail网站：

Unlike most Mozilla AddOns, Enigmail
  contains platform dependent parts: it
  depends on the CPU, the compiler,
  libraries of the operating system and
  the email application it shall
  integrate into.

查看Enigmail源代码，这可能是相关的部分(用c ++编写)

因此，我们可能需要将他们所做的事情翻译成js(！)或者继续寻找其他示例。

这是另一个可能有用的链接

这是我正在处理的一个扩展中的代码：

function SendObserver() {
  this.register();
}

SendObserver.prototype = {
  observe: function(subject, topic, data) {

     /* thunderbird sends a notification even when it's only saving the message as a draft.
      * We examine the caller chain to check for valid send notifications 
      */
     var f = this.observe;
     while (f) {
       if(/Save/.test(f.name)) {
           print("Ignoring send notification because we're probably autosaving or saving as a draft/template");
           return;
       }
       f = f.caller;
     }

     // add your headers here, separated by \r\n
     subject.gMsgCompose.compFields.otherRandomHeaders += "x-test: test\r\n"; 
     }

  },
  register: function() {
    var observerService = Components.classes["@mozilla.org/observer-service;1"]
                          .getService(Components.interfaces.nsIObserverService);
    observerService.addObserver(this, "mail:composeOnSend", false);
  },
  unregister: function() {
    var observerService = Components.classes["@mozilla.org/observer-service;1"]
                            .getService(Components.interfaces.nsIObserverService);
    observerService.removeObserver(this, "mail:composeOnSend");
  }
};

/*
 * Register observer for send events. Check for event target to ensure that the 
 * compose window is loaded/unloaded (and not the content of the editor).
 * 
 * Unregister to prevent memory leaks (as per MDC documentation).
 */
var sendObserver;
window.addEventListener('load', function (e) {if (e.target == document) sendObserver = new SendObserver(); }, true);
window.addEventListener('unload', function (e) { if (e.target == document) sendObserver.unregister();}, true);

将其放入由撰写窗口加载的.js文件中(例如，覆盖" chrome：//messenger/content/messengercompose/messengercompose.xul")。

在我的情况下，必须对SendObserver.observe进行检查，因为我想进行用户交互，但是我们可以将其忽略。