Examine source code of Princess Sessan

{
  "theme": {
    "images": {
      "theme_frame": "sessanhead.jpg"
    },
    "colors": {
      "frame": "#ff7300",
      "tab_background_text": "#fffb00"
    }
  },
  "version": "2.0",
  "name": "Princess Sessan",
  "manifest_version": 2,
  "description": "I wanted something with a picture of my three-legged cat Sessan (a former stray who I rescued), and since Sessan is slang for \"princess\" in Swedish I gave her a well deserved crown. :)"
}