Examine source code of Quick Notes is

{
  "manifest_version": 2,
  "name": "Quick Notes",
  "version": "1.0",
  "description": "Take quick notes in your browser",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ab338d46-f172-409b-8b3c-48d1a32e36a0}"
    }
  }
}