Examine source code of Torsti

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#1e9457",
      "tab_background_text": "#eb5d32"
    }
  },
  "version": "2.0",
  "name": "Torsti",
  "manifest_version": 2,
  "description": "Image of my cat, taken september 1990. His first summer. ."
}