Examine source code of Humber Bridge

{
  "theme": {
    "images": {
      "theme_frame": "HumberBridgeCroppedFF.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Humber Bridge",
  "manifest_version": 2,
  "description": "The Humber Bridge - The largest single span bridge in the world for 20 years!\nMy Home Town"
}