Examine source code of Hookit.com Background

{
  "theme": {
    "images": {
      "theme_frame": "Hookitcom_Firefox-Theme"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Hookit.com Background",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/7cb2f70b53327c06bdff7a5ce0578529eaae52fa4057e0eceeaa12e121e0692b/http%3A//Hookit.com\" rel=\"nofollow\">Hookit.com</a> background of action sports athletes and brands, including motocross, skateboarding, snowboarding, BMX and wakeboarding."
}