Examine source code of PuriCute

{
  "theme": {
    "images": {
      "theme_frame": "firefox_persona8.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#663366"
    }
  },
  "version": "2.0",
  "name": "PuriCute",
  "manifest_version": 2,
  "description": "Header created by <a href=\"https://outgoing.prod.mozaws.net/v1/224dbe3ba9bcb1428142c83bff930193408c3be20a4bc45daabbf3a94407afe2/http%3A//puricute.com\" rel=\"nofollow\">puricute.com</a>"
}