Examine source code of Blackie

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-1.jpg"
    },
    "colors": {
      "frame": "#ff0000",
      "tab_background_text": "#1aff00"
    }
  },
  "version": "2.0",
  "name": "Blackie",
  "manifest_version": 2,
  "description": "I like dark color, so.. here is the darkest I could do, everyone can do it, even babies."
}