Examine source code of BinarySkull

{
  "theme": {
    "images": {
      "theme_frame": "BinarySkull-persona.jpg"
    },
    "colors": {
      "frame": "#47f20e",
      "tab_background_text": "#23780c"
    }
  },
  "version": "2.0",
  "name": "BinarySkull",
  "manifest_version": 2,
  "description": "BinarySkull"
}