Examine source code of Grassssssss

{
  "theme": {
    "images": {
      "theme_frame": "12345theheadof.jpg"
    },
    "colors": {
      "frame": "#3a8734",
      "tab_background_text": "#3a8734"
    }
  },
  "version": "2.0",
  "name": "Grassssssss",
  "manifest_version": 2,
  "description": "cool"
}