Examine source code of SiteRanger

{
  "theme": {
    "images": {
      "theme_frame": "br0wserh43d9rcxxopy.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "SiteRanger",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/40c5fd7d7ee4f8504c7b590b6a003b9c6f9a7d3aa3bd32db4522363759962bef/http%3A//www.siteranger.de\" rel=\"nofollow\">www.siteranger.de</a>"
}