Examine source code of Thassos pebbles

{
  "theme": {
    "images": {
      "theme_frame": "Samos-pebbles-h.jpg"
    },
    "colors": {
      "frame": "#f21111",
      "tab_background_text": "#e8b910"
    }
  },
  "version": "2.0",
  "name": "Thassos pebbles",
  "manifest_version": 2,
  "description": "pebbles in on of several pictoresque beaches of Thassos island, Greece"
}