Examine source code of Cute Kids 2

{
  "theme": {
    "images": {
      "theme_frame": "CuteKids2.png"
    },
    "colors": {
      "frame": "#ffe100",
      "tab_background_text": "#ff0000"
    }
  },
  "version": "2.0",
  "name": "Cute Kids 2",
  "manifest_version": 2,
  "description": "Hey Firefox users!\n\nLet's create a happy atmosphere for the holidays! No matter if you're new to Firefox or if you've used it from the very beginning, you will find that the Cute Kids Series suit your browser well."
}