Disabling e10s notification in Firefox

Author: barancev

Diff for: javascript/firefox-driver/webdriver.json

@@ -2,6 +2,7 @@
   "frozen": {
     "app.update.auto": false,
     "app.update.enabled": false,
+    "browser.displayedE10SNotice": 4,
     "browser.download.manager.showWhenStarting": false,
     "browser.EULA.override": true,
     "browser.EULA.3.accepted": true,