Examine source code of Jassa.se Persona

{
  "theme": {
    "images": {
      "theme_frame": "head.png"
    },
    "colors": {
      "frame": "#efefef",
      "tab_background_text": "#efefef"
    }
  },
  "version": "2.0",
  "name": "Jassa.se Persona",
  "manifest_version": 2,
  "description": "Persona of swedish webmagazine <a href=\"https://outgoing.prod.mozaws.net/v1/ed2953fbaa687119973e1ad5d415b0a60912a2c6fd4fb1fac08bc118734f6a69/http%3A//Jassa.se\" rel=\"nofollow\">Jassa.se</a>"
}