Examine source code of Sharing hearts

{
  "theme": {
    "images": {
      "theme_frame": "HeartSLFPersonaheadereditII.jpg"
    },
    "colors": {
      "frame": "#f7c3c3",
      "tab_background_text": "#d40707"
    }
  },
  "version": "2.0",
  "name": "Sharing hearts",
  "manifest_version": 2,
  "description": "Sharing hearts for Valentine's Day and Love."
}