Examine source code of Heart Line

{
  "theme": {
    "images": {
      "theme_frame": "heartline.jpg"
    },
    "colors": {
      "frame": "#df4efc",
      "tab_background_text": "#f2c9c9"
    }
  },
  "version": "2.0",
  "name": "Heart Line",
  "manifest_version": 2,
  "description": "hearts\nvalentines day\nlove\ncolorful hearts\nshiny hearts\nred hearts\npink hearts\nlove"
}