■xpiファイルを解凍する

■組織内へのメールに全部チェックを入れるチェックボックスが効かない不具合の修正

■Ctrl + Enter でメールを送信しようとした場合に、メールが送信されない不具合を修正

//overlay
//C:\Program Files\Mozilla Thunderbird\chrome\messenger\content\messenger\messengercompose\MsgComposeCommands.js
function SendMessage()
{
	//add start
	if(!ConfirmAddress.checkAddress()){
		return;
	}
	//add end
/* //ここをコメントアウト
  dump("SendMessage from XUL\n");
  GenericSendMessage(nsIMsgCompDeliverMode.Now);
*/
  //ここから下を追加
  let sendInBackground =
    Components.classes["@mozilla.org/preferences-service;1"]
              .getService(Components.interfaces.nsIPrefBranch)
              .getBoolPref("mailnews.sendInBackground");

  GenericSendMessage(sendInBackground ?
                     nsIMsgCompDeliverMode.Background :
                     nsIMsgCompDeliverMode.Now);
  //追加ここまで
}

//overlay
//C:\Program Files\Mozilla Thunderbird\chrome\messenger\content\messenger\messengercompose\MsgComposeCommands.js
function SendMessageWithCheck()
{
	//add start
	if(!ConfirmAddress.checkAddress()){
		return;
	}
	//add end
/* //ここをコメントアウト
    var warn = sPrefs.getBoolPref("mail.warn_on_send_accel_key");

    if (warn) {
        var checkValue = {value:false};
        var buttonPressed = gPromptService.confirmEx(window, 
              sComposeMsgsBundle.getString('sendMessageCheckWindowTitle'), 
              sComposeMsgsBundle.getString('sendMessageCheckLabel'),
              (gPromptService.BUTTON_TITLE_IS_STRING * gPromptService.BUTTON_POS_0) +
              (gPromptService.BUTTON_TITLE_CANCEL * gPromptService.BUTTON_POS_1),
              sComposeMsgsBundle.getString('sendMessageCheckSendButtonLabel'),
              null, null,
              sComposeMsgsBundle.getString('CheckMsg'), 
              checkValue);
        if (buttonPressed != 0) {
            return;
        }
        if (checkValue.value) {
            sPrefs.setBoolPref("mail.warn_on_send_accel_key", false);
        }
    }

  GenericSendMessage(gIsOffline ? nsIMsgCompDeliverMode.Later
                                 : nsIMsgCompDeliverMode.Now);
*/
    //ここから追加
    var warn = getPref("mail.warn_on_send_accel_key");

    if (warn) {
        var checkValue = {value:false};
        var bundle = document.getElementById("bundle_composeMsgs");
        var buttonPressed = gPromptService.confirmEx(window,
              bundle.getString('sendMessageCheckWindowTitle'),
              bundle.getString('sendMessageCheckLabel'),
              (gPromptService.BUTTON_TITLE_IS_STRING * gPromptService.BUTTON_POS_0) +
              (gPromptService.BUTTON_TITLE_CANCEL * gPromptService.BUTTON_POS_1),
              bundle.getString('sendMessageCheckSendButtonLabel'),
              null, null,
              bundle.getString('CheckMsg'),
              checkValue);
        if (buttonPressed != 0) {
            return;
        }
        if (checkValue.value) {
            var branch = Components.classes["@mozilla.org/preferences-service;1"]
                                   .getService(Components.interfaces.nsIPrefBranch);

            branch.setBoolPref("mail.warn_on_send_accel_key", false);
        }
    }

  let sendInBackground =
    Components.classes["@mozilla.org/preferences-service;1"]
              .getService(Components.interfaces.nsIPrefBranch)
              .getBoolPref("mailnews.sendInBackground");

  GenericSendMessage(gIsOffline ? nsIMsgCompDeliverMode.Later :
                     (sendInBackground ?
                      nsIMsgCompDeliverMode.Background :
                      nsIMsgCompDeliverMode.Now));
  //追加ここまで
}

■ついでにThunderbird3.1でも使えるようにする

最後にもういちどzipファイルに圧縮する