關於此附加元件
Reply All Control simply disables the Reply All button and menu items if one of your email addresses doesn't appear in the To: or Cc: fields of an email. It is control by a Boolean preference named extensions.ReplyAllControl.ReplyAllControlDisabled and set to "false" by default. If set to "true" the Reply All button and menu item will be enabled for all messages, effectively disabling the extension.