Examine source code of middlesbrough...

{
  "theme": {
    "images": {
      "theme_frame": "Marchpersona.jpg"
    },
    "colors": {
      "frame": "#e61010",
      "tab_background_text": "#e87474"
    }
  },
  "version": "2.0",
  "name": "middlesbrough...",
  "manifest_version": 2,
  "description": "The mighty boro through the years"
}