Examine source code of Iceweasel Tango

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Iceweasel Tango",
  "manifest_version": 2,
  "description": "Ice Weasel Icon was made by: Ricardo Espinosa\n<a href=\"https://outgoing.prod.mozaws.net/v1/8ae56a945901d8c55f95f08e1cf0489ab0c95870169566c0a62e340bd5c4fe00/http%3A//tinyurl.com/yclly9q\" rel=\"nofollow\">http://tinyurl.com/yclly9q</a>"
}