Examine source code of Abstract Rainbow Hearts

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#4b0aa6",
      "tab_background_text": "#f2f0f5"
    }
  },
  "version": "2.0",
  "name": "Abstract Rainbow Hearts",
  "manifest_version": 2,
  "description": "A line of rainbow color hearts with a 3D look on a transparent background (I hope)."
}