webdriver.php

<?php

    $options = new ChromeOptions();

    $options->addExtensions(array(
       __DIR__ . '/extension/requests.crx'
    ));

    $caps = DesiredCapabilities::chrome();
    $caps->setCapability(ChromeOptions::CAPABILITY, $options);
    $driver = RemoteWebDriver::create($this->getWebdriverHost(), $caps);