Examine source code of Amsterdam Canals - 2

{
  "theme": {
    "images": {
      "theme_frame": "Firefox_Amsterdam_Canals_2_1.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#171717"
    }
  },
  "version": "2.0",
  "name": "Amsterdam Canals - 2",
  "manifest_version": 2,
  "description": "Amsterdam, Holland. That city is definitely a superb, cool and lively spot, a place where sailing is a very popular activity on the numerous and picturesque waterways. Amsterdam's world-famous vintage canals are the perfect place for quiet, safe, genial boating, with your family, your friend(s) -- or just with your favorite cactus if you prefer..."
}