Examine source code of MoD Skull

{
  "theme": {
    "images": {
      "theme_frame": "persona_skull_mod.jpg"
    },
    "colors": {
      "frame": "#4f4e4e",
      "tab_background_text": "#dedede"
    }
  },
  "version": "2.0",
  "name": "MoD Skull",
  "manifest_version": 2,
  "description": "MoD Skull..... Simply...."
}