Examine source code of Rorschach - Watchmen

{
  "theme": {
    "images": {
      "theme_frame": "firefoxrorschach3.jpg"
    },
    "colors": {
      "frame": "#f7ff05",
      "tab_background_text": "#faff6b"
    }
  },
  "version": "2.0",
  "name": "Rorschach - Watchmen",
  "manifest_version": 2,
  "description": "Everyone's favourite psychopath - Rorschach, from Watchmen"
}