Examine source code of CRX Installer

{
  "name": "CRX Installer",
  "description": "Install Chrome extension to Floorp/Firefox nightly/Librewolf",
  "version": "3.3",
  "manifest_version": 3,
  "icons": {
    "128": "icon.png"
  },
  "action": {
    "default_title": "CRX Installer"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "*://chromewebstore.google.com/*"
      ]
    }
  ],
  "permissions": [
    "management",
    "tabs",
    "contextualIdentities",
    "storage"
  ],
  "host_permissions": [
    "*://clients2.google.com/*",
    "*://clients2.googleusercontent.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "XPIPorter@XPIPorter"
    }
  }
}