Examine source code of Raining Heartstrings

{
  "theme": {
    "images": {
      "theme_frame": "RainingHearstrings.jpg"
    },
    "colors": {
      "frame": "#7c23cf",
      "tab_background_text": "#996161"
    }
  },
  "version": "2.0",
  "name": "Raining Heartstrings",
  "manifest_version": 2,
  "description": "Various heart shapes raining down"
}