Examine source code of Ewilth Twitch list

{
  "manifest_version": 2,
  "name": "Ewilth Twitch list",
  "version": "1.24",
  "description": "Trouble deciding what to watch on Twitch? This addon lists live Twitch streams excluding the users/games you've blocked.",
  "icons": {
    "48": "icon-48.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage",
    "https://api.twitch.tv/",
    "https://id.twitch.tv/"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icon-48.png"
    },
    "default_popup": "ewilth.html"
  },
  "applications": {
    "gecko": {
      "id": "{bfddb836-bc8a-40f1-b757-4a33b222906a}"
    }
  }
}