Examine source code of gltsvsu

{
  "theme": {
    "images": {
      "theme_frame": "Firefox_theme_Kazimierz.jpg"
    },
    "colors": {
      "frame": "#5e0707",
      "tab_background_text": "#121111"
    }
  },
  "version": "2.0",
  "name": "gltsvsu",
  "manifest_version": 2,
  "description": "Landscape view of Vistula River, Kazimierz Dolny, Poland, Sept. 2009"
}