Examine source code of Darkness E

{
  "theme": {
    "images": {
      "theme_frame": "DarknessE.jpg"
    },
    "colors": {
      "frame": "#2b2b2b",
      "tab_background_text": "#a1a1a1"
    }
  },
  "version": "2.0",
  "name": "Darkness E",
  "manifest_version": 2,
  "description": "Plain Black with small strips of grey."
}