Examine source code of Serious Trainer

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_ST2.jpg"
    },
    "colors": {
      "frame": "#e61212",
      "tab_background_text": "#bac"
    }
  },
  "version": "2.0",
  "name": "Serious Trainer",
  "manifest_version": 2,
  "description": "This is the Logo for <a href=\"https://outgoing.prod.mozaws.net/v1/f56be1f8bf420a85a39135e6b62b98d7f45948b2f83395b0ef714777c99356c4/http%3A//www.serioustrainer.com\" rel=\"nofollow\">http://www.serioustrainer.com</a>"
}