FirefoxProfile firefoxHeadlessProfile = new FirefoxProfile
{
    DeleteAfterUse = true
};
firefoxHeadlessProfile.SetPreference("browser.cache.disk.enable", false);
firefoxHeadlessProfile.SetPreference("browser.cache.memory.enable", false);
firefoxHeadlessProfile.SetPreference("browser.cache.offline.enable", false);
firefoxHeadlessProfile.SetPreference("network.http.use-cache", false);
FirefoxOptions firefoxHeadlessOptions = new FirefoxOptions
{
    Profile = firefoxHeadlessProfile
};
firefoxHeadlessOptions.AddArgument("--headless");
// Cast to DesiredCapabilities from the ICapabilities interface to make it mutable
DesiredCapabilities desiredCapabilities = (DesiredCapabilities) firefoxHeadlessOptions.ToCapabilities();
desiredCapabilities.SetCapability("idleTimeout", 300);
desiredCapabilities.SetCapability("tz", "America/Chicago");
desiredCapabilities.SetCapability("recordVideo", EnableZaleniumVideoRecording);
IWebDriver WebDriver = new RemoteWebDriver(GridHubUri, desiredCapabilities, GridCommandTimeout);