Examine source code of Agent Spoofer

{
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "agent-spoofer@addon"
    }
  },
  "name": "Agent Spoofer",
  "version": "2025.5.21.2",
  "description": "Spoof browser user agent and other attributes.",
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "scripting"
  ],
  "background": {
    "scripts": [
      "version.js",
      "profile.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "version.js",
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Agent Spoofer"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "200": "icon.png"
  }
}