Examine source code of Mountain Foil

{
  "theme": {
    "images": {
      "theme_frame": "MountainFoilHeader.jpg"
    },
    "colors": {
      "frame": "#418a41",
      "tab_background_text": "#00ff00"
    }
  },
  "version": "2.0",
  "name": "Mountain Foil",
  "manifest_version": 2,
  "description": "Got this photo from <a href=\"https://outgoing.prod.mozaws.net/v1/67ce965d8ae9036548eeada08d9cd80fd1dfefd2436672356d17329fee649fed/http%3A//rgbstock.com\" rel=\"nofollow\">rgbstock.com</a>.  Credit goes to the photographer (I don't remember who that is), but I am using it according to the guidelines."
}