Examine source code of Quick Notes simple

{
  "manifest_version": 2,
  "name": "Quick Notes",
  "version": "1.0",
  "description": "A simple extension to create quick notes.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{15732793-0a7a-4016-839f-6cd77642d66c}"
    }
  }
}