Examine source code of PixelMonsterGraphics.com

{
  "theme": {
    "images": {
      "theme_frame": "firefoxpersona.png"
    },
    "colors": {
      "frame": "#e1e809",
      "tab_background_text": "#a19e9e"
    }
  },
  "version": "2.0",
  "name": "PixelMonsterGraphics.com",
  "manifest_version": 2,
  "description": "Persona for <a href=\"https://outgoing.prod.mozaws.net/v1/4cfffc623e6569526804c5c777fe2dbfa21dda12c37e396531ee5571a89cfe14/http%3A//pixelmonstergraphics.com\" rel=\"nofollow\">pixelmonstergraphics.com</a>"
}