Examine source code of F1/F2 Session Tracker

{
  "manifest_version": 2,
  "name": "F1/F2 Session Tracker",
  "version": "1.0",
  "description": "Display the next F1 and F2 session times.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a3197f1a-348c-41a8-b5f0-0efd0afe4c70}"
    }
  }
}