Examine source code of Habit Tracker v2

{
  "manifest_version": 2,
  "name": "Habit Tracker",
  "version": "1.0",
  "description": "Track your daily habits.",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fd405fe0-b50d-4048-a89f-b4c073efa350}"
    }
  }
}