Examine source code of Silver Batman

{
  "theme": {
    "images": {
      "theme_frame": "batmantop.png"
    },
    "colors": {
      "frame": "#918888",
      "tab_background_text": "#fcf7f7"
    }
  },
  "version": "2.0",
  "name": "Silver Batman",
  "manifest_version": 2,
  "description": "Silver Batman logo from Nicholas Gallimore"
}