Prevent the additional welcome URL for Windows 10 from being opened

Author: davehunt

javascript/firefox-driver/webdriver.json

@@ -61,6 +61,7 @@
     "browser.newtabpage.enabled": false,
     "browser.startup.page": 0,
     "browser.startup.homepage": "about:blank",
+    "browser.usedOnWindows10.introURL": "about:blank",
     "dom.max_chrome_script_run_time": 30,
     "dom.max_script_run_time": 30,
     "dom.report_all_js_exceptions": true,