Examine source code of purple retro pattern

{
  "theme": {
    "images": {
      "theme_frame": "FRONT73AAa.JPG"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "purple retro pattern",
  "manifest_version": 2,
  "description": "pattern from <a href=\"https://outgoing.prod.mozaws.net/v1/ecf419a7d6b8a13abfb726737b69075d40a6eaa4fe92dbaadce26ae736275af6/http%3A//www.papierpeintdesannees70.com/\" rel=\"nofollow\">http://www.papierpeintdesannees70.com/</a>"
}