Examine source code of Standard User Agent

{
  "manifest_version": 3,
  "name": "Standard User Agent",
  "version": "1.0.0",
  "description": "Blend in with the most common Firefox UA",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "scripting",
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-scripts/spoof.js"
      ],
      "world": "MAIN",
      "all_frames": true,
      "match_origin_as_fallback": true,
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-scripts/bridge.js"
      ],
      "all_frames": true,
      "match_origin_as_fallback": true,
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "standard-ua@tn3w",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_data": false
      }
    }
  }
}