Examine source code of Happy Birday

{
  "theme": {
    "images": {
      "theme_frame": "birdayheader.jpg"
    },
    "colors": {
      "frame": "#faf7f7",
      "tab_background_text": "#f8fc05"
    }
  },
  "version": "2.0",
  "name": "Happy Birday",
  "manifest_version": 2,
  "description": "Birthday, Bird`Day, Birds, Happy, Birth, Occasion, Celebration, Presents, Confetti, Piniata, grabbag, party favours"
}