Examine source code of Quick Note

{
  "manifest_version": 2,
  "name": "Quick Note",
  "version": "1.0",
  "description": "A simple addon to take quick notes directly in Firefox.",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a73a3ff9-07d1-42c7-b9ee-bab1bc5fb87e}"
    }
  }
}