Selenium 4 requires Firefox 78 or greater. It is recommended to always use the latest version of geckodriver. Options Capabilities common to all browsers are described on the Options page. Capabilities unique to Firefox can be found at Mozilla’s page for firefoxOptions Starting a Firefox session with basic defined options looks like this: Java Python CSharp Ruby JavaScript Kotlin FirefoxOptions options = new FirefoxOptions(); driver = new FirefoxDriver(options); View Complete Code View on G...