In Firefox, execution of javascript to get 'tagName' will stuck.

[leiwang008]

Environment: webdriver-standalone2.47.1 and Firefox42.0 on windows7.
To get a bunch of properties value, we execute javascript to put the properties [name, value] into a map. For other properties, the execution runs finely, but for property 'tagName', it will stuck. Below is a simple test to reproduce this problem.

    DesiredCapabilities capabilities = DesiredCapabilities.firefox();
    //DesiredCapabilities capabilities = DesiredCapabilities.chrome();//No problem with CHROME
    //DesiredCapabilities capabilities = DesiredCapabilities.internetExplorer();//No problem with IE

    capabilities.setJavascriptEnabled(true);
    //We should start the standalone driver on port 4444 manually.
    WebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"), capabilities);

    driver.get("http://www.google.com");
    WebElement searchbox = driver.findElement(By.id("lst-ib"));

    String script = "function getHtmlProperties(domNode){\n"+
            "  var propMap={}; \n"+
            "  if( domNode!=undefined ){\n"+
            //"  propMap['tagname']=domNode.tagName;"+ //with 'tagname' as map key, execution will pass
            "  propMap['tagName']=domNode.tagName;"+ //with 'tagName' as map key, execution will stuck
            "  }\n"+
            "  return propMap;\n"+
            "}\n"+
            "\n return getHtmlProperties(arguments[0]); \n";

    Object result = ((JavascriptExecutor) driver).executeScript(script, searchbox);
    System.out.println(result);

    driver.close();

[barancev]

Fixed by commit d1e9b27