function disable_firebug() {
  var names = ["log", "debug", "info", "warn", "error", "assert", "dir", "dirxml",
  "group", "groupEnd", "time", "timeEnd", "count", "trace", "profile", "profileEnd"];

  window.console = {};
  for (var i = 0; i < names.length; ++i) {
    window.console[names[i]] = function() {};
  }
}

if (!("console" in window) || !("firebug" in console)) {
  disable_firebug();
}