Examine source code of User Agent

{
  "browser_specific_settings": {
    "gecko": {
      "id": "sandvpn_@sandvpn_.com",
      "strict_min_version": "91.1.0"
    }
  },
  "name": "SandUserAgent",
  "description": "Fast, Secure, Stable",
  "version": "1.3",
  "manifest_version": 2,
  "web_accessible_resources": [
    "background.js"
  ],
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "SandUserAgent"
  },
  "icons": {
    "16": "logo192.png",
    "48": "logo192.png",
    "128": "logo192.png"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "js": [
        "navigator_change.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "match_about_blank": true,
      "all_frames": true
    }
  ]
}