Examine source code of Happy Green Day

{
  "theme": {
    "images": {
      "theme_frame": "stpatsday.jpg"
    },
    "colors": {
      "frame": "#ebfcea",
      "tab_background_text": "#f7f2f2"
    }
  },
  "version": "2.0",
  "name": "Happy Green Day",
  "manifest_version": 2,
  "description": "clovers\nshamrocks\nst pattys day\nst patricks day\nst pats day\ngreen day\nluck o the irish\nirish\nrainbows"
}