Examine source code of Episode Tracker

{
  "manifest_version": 2,
  "name": "Episode Tracker",
  "version": "1.4.0",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup/index.html",
    "default_title": "Episode Tracker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{053bca40-f515-4d88-9b43-a42a9654a100}"
    }
  }
}