Examine source code of Simple Minecraft Grass

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#613c3c",
      "tab_background_text": "#1ab027"
    }
  },
  "version": "2.0",
  "name": "Simple Minecraft Grass",
  "manifest_version": 2,
  "description": "a simple theme based on the minecraft grass.\nthis is also my first theme."
}