Examine source code of JSON F&P

{
  "manifest_version": 2,
  "name": "JSON F&P",
  "version": "0.1",
  "author": "Ritchie 王则钰",
  "description": "Automatically format and prettify JSON data",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "scripts/content.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd53f169-56f4-44b1-982e-902b550482a3}"
    }
  }
}