Examine source code of twelve string

{
  "theme": {
    "images": {
      "theme_frame": "393395666_f2254973b2_o_edited_3.jpg"
    },
    "colors": {
      "frame": "#737171",
      "tab_background_text": "#fcf9f9"
    }
  },
  "version": "2.0",
  "name": "twelve string",
  "manifest_version": 2,
  "description": "Wideawake 12 string"
}