Examine source code of Straken

{
  "theme": {
    "images": {
      "theme_frame": "straken.jpg"
    },
    "colors": {
      "frame": "#bdbdbd",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "Straken",
  "manifest_version": 2,
  "description": "Picture of lake Stråken, Småland (Sweden)"
}