Examine source code of Dropdead cat

{
  "theme": {
    "images": {
      "theme_frame": "persona3000.jpg"
    },
    "colors": {
      "frame": "#100a3d",
      "tab_background_text": "#b1a4ed"
    }
  },
  "version": "2.0",
  "name": "Dropdead cat",
  "manifest_version": 2
}