Examine source code of AmericanLuxembourger

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxLuxembourgPersonacopy3.jpg"
    },
    "colors": {
      "frame": "#e8d8d8",
      "tab_background_text": "#1c0606"
    }
  },
  "version": "2.0",
  "name": "AmericanLuxembourger",
  "manifest_version": 2,
  "description": "Modern flag of Luxembourg together with the coat of arms of the Duchy of Luxembourg"
}