Examine source code of Rainbow Crayon Designs

{
  "theme": {
    "images": {
      "theme_frame": "rainbowcrayons.png"
    },
    "colors": {
      "frame": "#666666",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Rainbow Crayon Designs",
  "manifest_version": 2,
  "description": "Made with a really cool crayons brush set (but that set wasn't mine) in pixels"
}