Examine source code of PowDev Gray

{
  "theme": {
    "images": {
      "theme_frame": "toppersonagray.jpg"
    },
    "colors": {
      "frame": "#f70a0a",
      "tab_background_text": "#524f4f"
    }
  },
  "version": "2.0",
  "name": "PowDev Gray",
  "manifest_version": 2,
  "description": "For PowDev : <a href=\"https://outgoing.prod.mozaws.net/v1/1520e363967ffc034063c5e78a78154647afc8bc39299aacee0fc0ed4579f8b2/http%3A//www.powdev.com\" rel=\"nofollow\">www.powdev.com</a> : Gray"
}