Examine source code of Backcountry Gray

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#cfcfcf",
      "tab_background_text": "#212121"
    }
  },
  "version": "2.0",
  "name": "Backcountry Gray",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/3382f70fe837c2f58638a410f4f7b666439756bfa399fd8dc32df7db38d61f7e/http%3A//Backcountry.com\" rel=\"nofollow\">Backcountry.com</a> non official persona."
}