Examine source code of Ctrl-Zed - DeAmericanise the Web

{
  "version": "0.4.3",
  "browser_specific_settings": {
    "gecko": {
      "id": "ctrl-zed@ctrl-zed.org",
      "strict_min_version": "126.0"
    },
    "chromium": {
      "content_security_policy": {
        "sandbox": "allow-scripts allow-forms allow-popups allow-modals; script-src 'self' 'unsafe-inline' 'unsafe-eval'; child-src 'self';"
      }
    }
  },
  "manifest_version": 3,
  "name": "Ctrl-Zed - De-Americanise the Web",
  "description": "Replace USA defaults automatically (e.g. Fahrenheit, MM-DD-YYYY, ...much more)",
  "icons": {
    "16": "icons/ctrl-zed-16.png",
    "32": "icons/ctrl-zed-32.png",
    "48": "icons/ctrl-zed-48.png",
    "128": "icons/ctrl-zed-128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "webNavigation"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/scripts.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "./scripts/content.ts"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  },
  "author": "Ctrl-Zed"
}