Examine source code of Darkened Overcast

{
  "theme": {
    "images": {
      "theme_frame": "spiritspersonaT.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Darkened Overcast",
  "manifest_version": 2,
  "description": "A background and site banner image created entirely with a mouse on Adobe Photoshop for a project. It made a good persona. :)"
}