??????????????????????Firefox??setPreference
?????????????FF ??extensions.firebug.allPagesActivation?????ON??firebug??active

  File file=new File("C:\webdriver\firebug-2.0.4-fx.xpi");//????Firebug·??
  FirefoxProfile profile = new FirefoxProfile();
  profile.setPreference("network.proxy.type"?? 2);
  profile.setPreference("network.proxy.autoconfig_url"??"http://proxy.successfactors.com:8083"); //???????????
  try {
  //add firebug
  profile.addExtension(file);
  profile.setPreference("extensions.firebug.currentVersion"?? "2.0.4");//????firebug ?汾
  //active firebug extensions
  profile.setPreference("extensions.firebug.allPagesActivation"?? "on");
  } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  WebDriver driver = new FirefoxDriver(profile);
  driver.get("http://www.dbyl.cn");
  Actions actions=new Actions(driver);
  driver.manage().window().maximize();
  driver.manage().timeouts().implicitlyWait(60?? TimeUnit.SECONDS);
  driver.manage().timeouts().pageLoadTimeout(30?? TimeUnit.SECONDS);