Examine source code of Cute Smile

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#212020"
    }
  },
  "version": "2.0",
  "name": "Cute Smile",
  "manifest_version": 2,
  "description": "Intended for personal use, but I'll share it, it's my drawing after all...\nI want too share it to the world, lol"
}