Examine source code of JSON Formatter Extension

{
  "manifest_version": 2,
  "name": "JSON Formatter Extension",
  "version": "1.0.6",
  "description": "Format JSON content on specified websites",
  "permissions": [
    "storage",
    "https://*/*",
    "http://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "selcuk.help@gmail.com",
      "strict_min_version": "115.0"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "libs/browser-polyfill.js",
        "libs/json-formatter.umd.js",
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ]
}