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    function 
    checkXPCShell () 
    {
      return (typeof(clear) == "function"   &&
              typeof(gc) == "function"      &&
              typeof(dumpXPC) == "function" &&
              typeof(build)   == "function" &&
              typeof(clear)   == "function" &&
              typeof(load) == "function");
  
    }
  
    // this is a work around for bug #209045
    // https://bugzilla.mozilla.org/show_bug.cgi?id=209045
    function 
    xpcShellLoad (aURL) 
    {
      var localFile = aURL.replace(/:\/|content\//g, "");
      dump("xpcShell loading ... "+localFile+"\n");
      load(localFile);
    }
  
    // include debug methods
    const jslib_debug = JS_LIB_PATH+"debug/debug.js"
    include(jslib_debug);
  
    function jslibUninstall (aPackage, aCallback)
    {
      if (!aPackage) {
        jslibErrorWarn("NS_ERROR_XPC_NOT_ENOUGH_ARGS");
        throw - jslibRes.NS_ERROR_INVALID_ARG;
      }
  
      include (jslib_window);
      var win = new CommonWindow(null, 400, 400);
      win.position = JS_MIDDLE_CENTER;
      win.openUninstallWindow(aPackage, aCallback);
    }
  
    /**
     * Launch JSLIB Splash 
     */
    function jslibLaunchSplash ()
    {
      include (jslib_window);
      var win = new CommonWindow("chrome://jslib/content/splash.xul", 400, 220);
      win.position = JS_MIDDLE_CENTER;
      win.openSplash();
    }
  
    function jslibLaunchConsole ()
    {
      include (jslib_window);
      var win = new CommonWindow("javascript:", 400, 220);
      win.position = JS_MIDDLE_CENTER;
      win.open();
    }
  
    function jslibTurnDumpOn () 
    {
      include (jslib_prefs);
      // turn on dump
      var pref = new Prefs;
      const prefStr = "browser.dom.window.dump.enabled"
  
      // turn dump on if not enabled
      if (!pref.getBool(prefStr)) {
        pref.setBool(prefStr, true);
        pref.save();
      } 
  
      return;
    }
  
    // DEPRICATED
    var jslib_turnDumpOn = jslibTurnDumpOn;
  
    function jslibTurnDumpOff () 
    {
      include (jslib_prefs);
      // turn off dump
      var pref = new Prefs;
      const prefStr = "browser.dom.window.dump.enabled"
  
      // turn dump off if enabled
      if (pref.getBool(prefStr)) {
        pref.setBool(prefStr, false);
        pref.save();
      } 
  
      return;
    }
  
    // DEPRICATED
    var jslib_turnDumpOff = jslibTurnDumpOff;
  
    function jslibTurnStrictOn () 
    {
      include (jslib_prefs);
      // turn on dump
      var pref = new Prefs;
      const prefStr = "javascript.options.strict";
  
      // turn dump on if not enabled
      if (!pref.getBool(prefStr)) {
        pref.setBool(prefStr, true);
        pref.save();
      } 
      return;
    }
  
    function jslibTurnStrictOff () 
    {
      include (jslib_prefs);
      // turn off dump
      var pref = new Prefs;
      const prefStr = "javascript.options.strict";
  
      // turn dump off if enabled
      if (pref.getBool(prefStr)) {
        pref.setBool(prefStr, false);
        pref.save();
      } 
      return;
    }
  
    const jslib_modules = JS_LIB_PATH+"modules.js"
    include (jslib_modules);
  
  } catch (e) { dump(e + '\n'); }

  function jslibRestartApp () 
  {
    try 
    {
      var as = jslibGetService("@mozilla.org/toolkit/app-startup;1", 
                               "nsIAppStartup");

      as.quit(jslibI.nsIAppStartup.eRestart | jslibI.nsIAppStartup.eAttemptQuit);
    } catch (e) { dump(e + '\n'); }
  } 
}