Examine source code of Simple Dark Moka

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#555555",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Simple Dark Moka",
  "manifest_version": 2,
  "description": "#555 background color to complement the <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/18776205b13f0ec2bbd9ddd304e8a6d23c458bed82ec7956258b9cdb790d7580/http%3A//mokaproject.com/\">moka project</a>"
}