Examine source code of Shan World

{
  "theme": {
    "images": {
      "theme_frame": "Header.jpg"
    },
    "colors": {
      "frame": "#696363",
      "tab_background_text": "#f50505"
    }
  },
  "version": "2.0",
  "name": "Shan World",
  "manifest_version": 2,
  "description": "Shan World Firefox Theme is create by GNJ.\n\nPlease Do not modified or copy the images from Shan State Theme. \n\n<a href=\"https://outgoing.prod.mozaws.net/v1/1454760cdad24b2dbb13ab15b6ddba15d8ebea2466f6c1ec8465bb29ae4f3add/http%3A//www.goldninjar.com\" rel=\"nofollow\">www.goldninjar.com</a>\n<a href=\"https://outgoing.prod.mozaws.net/v1/32d88bc2217d15db64e4c8d77965485f916d9776c2dd08db8ccb9a304f2c2c06/http%3A//www.siamtai.com\" rel=\"nofollow\">www.siamtai.com</a>"
}