Examine source code of Selection.com

{
  "theme": {
    "images": {
      "theme_frame": "SelectionPersona4.png"
    },
    "colors": {
      "frame": "#384999",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Selection.com",
  "manifest_version": 2,
  "description": "The Official <a href=\"https://outgoing.prod.mozaws.net/v1/42df19d2f3db74689c77a3390248603770e01ad9c4fbf66d8edd2a638cb95f14/http%3A//Selection.com\" rel=\"nofollow\">Selection.com</a> Persona"
}