gecko/testing/mochitest/tests/SimpleTest/PluginUtils.js

var PluginUtils =
{
  withTestPlugin : function(callback)
  {
    if (typeof Components == "undefined")
    {
      todo(false, "Not a Mozilla-based browser");
      return false;
    }

    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
    var ph = Components.classes["@mozilla.org/plugin/host;1"]
                       .getService(Components.interfaces.nsIPluginHost);
    var tags = ph.getPluginTags();

    // Find the test plugin
    for (var i = 0; i < tags.length; i++)
    {
      if (tags[i].name == "Test Plug-in")
      {
        callback(tags[i]);
        return true;
      }
    }
    todo(false, "Need a test plugin on this platform");
    return false;
  }
};