1255220 - Firefox sometimes returning before loadEventEnd when run via WebDriver

Status: RESOLVED INVALID

(Firefox :: Untriaged, defect)

Description

[Clay Martin]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Safari/537.36 Edge/14.14284

Steps to reproduce:

1. Launch Firefox w/ WebDriver
2. Navigate to a page (my case was https://www.brainpop.com/)
3. Execute Script - return performance.timing.loadEventEnd - performance.timing.navigationStart;

        static void SiteLoadTime(string site, string browser, RemoteWebDriver driver)
        {
            for (int i = 0; i < iterations; i++)
            {
                driver.Manage().Window.Maximize();
                driver.Url = site;
                var timing = driver.ExecuteScript("return performance.timing.loadEventEnd - performance.timing.navigationStart;");
                var result = Convert.ToInt32(timing); // This line will throw as the value will be larger than an Int32 is allowed to be
            }
        }


Actual results:

Occaisionally getting a large negative value, looks like LoadEvent is either 0 or null. Values like:
-1457567313787


Expected results:

A positive ms value representing page load time. It happens occasionally but not every time.

Comment 1

[Kohei Yoshino [:kohei]]

You may want to report the issue to the Selenium team instead.