Examine source code of simple plan

{
  "theme": {
    "images": {
      "theme_frame": "simple_plan333.jpg"
    },
    "colors": {
      "frame": "#0d0c0c",
      "tab_background_text": "#ab44ab"
    }
  },
  "version": "2.0",
  "name": "simple plan",
  "manifest_version": 2
}