Examine source code of fallen_leaves

{
  "theme": {
    "images": {
      "theme_frame": "fallen_leavesalto.jpg"
    },
    "colors": {
      "frame": "#c9c9c9",
      "tab_background_text": "#ffff33"
    }
  },
  "version": "2.0",
  "name": "fallen_leaves",
  "manifest_version": 2,
  "description": "autumn,scenery,cold,wet,rain,mold,falls,withered,mushrooms,woods,forests,\ntrees,leaf,photography,green,red,yellow,orange,amazing,awesome,season"
}