Examine source code of Modified Containment

{
  "theme": {
    "images": {
      "theme_frame": "header1.jpg"
    },
    "colors": {
      "frame": "#212121",
      "tab_background_text": "#ff9d00"
    }
  },
  "version": "2.0",
  "name": "Modified Containment",
  "manifest_version": 2,
  "description": "Modified Orange Containment.\n\nAll credits to <a href=\"https://outgoing.prod.mozaws.net/v1/58e22e6ea73b4fc312f1c6975e9c5ac2f406c3a5476e08d80db60ccb13df29b5/http%3A//DigitalBlasphemy.com\" rel=\"nofollow\">DigitalBlasphemy.com</a>"
}