Examine source code of KillSkill_v1

{
  "theme": {
    "images": {
      "theme_frame": "1.jpg"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#cccccc"
    }
  },
  "version": "2.0",
  "name": "KillSkill_v1",
  "manifest_version": 2,
  "description": "For fun"
}