Examine source code of emojifinder.org

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "emojifinder.org",
  "manifest_version": 2,
  "description": "Search for the perfect Emojis with easy instant-search.\n\n25,000+ emojis available to instant-search for that perfect description, emoticons, person, or thing.\nAddon uses 3rd party site (<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/d401a31dd3c696c27d4fe1201ba3884da694f7ffb0a876645c0f5f500d4ded74/http%3A//www.emojifinder.org\">www.emojifinder.org</a>) for operation"
}