Examine source code of I Want Sushi

{
  "theme": {
    "images": {
      "theme_frame": "personasheader.JPG"
    },
    "colors": {
      "frame": "#1b4ecf",
      "tab_background_text": "#030303"
    }
  },
  "version": "2.0",
  "name": "I Want Sushi",
  "manifest_version": 2,
  "description": "Love sushi? Then this might make you hungry. Raw fish, Prawns, and wasabi, what more could you ask for?"
}