Examine source code of ToDo List Manager v2

{
  "manifest_version": 2,
  "name": "ToDo List Manager",
  "version": "1.0",
  "description": "Manage your daily tasks and to-dos directly from your browser.",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{eb77cff5-25b3-4f20-b5e2-531f5627bdd1}"
    }
  }
}