Examine source code of Dark Zone

{
  "theme": {
    "images": {
      "theme_frame": "Zonehead.jpg"
    },
    "colors": {
      "frame": "#c2bebe",
      "tab_background_text": "#5f89ed"
    }
  },
  "version": "2.0",
  "name": "Dark Zone",
  "manifest_version": 2,
  "description": "Dark theme with blue text."
}