Examine source code of Threat UA Switcher

{
  "manifest_version": 3,
  "name": "Threat UA Switcher",
  "version": "0.4.6",
  "description": "Per-tab or global User-Agent switcher for defensive security research and threat intelligence.",
  "author": "Andrea Draghetti",
  "developer": {
    "name": "Andrea Draghetti",
    "url": "https://github.com/drego85/Threat-UA-Switcher"
  },
  "homepage_url": "https://github.com/drego85/Threat-UA-Switcher",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "lib/presets.js",
      "lib/header-utils.js",
      "background.js"
    ]
  },
  "action": {
    "default_title": "Threat UA Switcher",
    "default_icon": {
      "16": "icons/icon-toolbar-16.png",
      "32": "icons/icon-toolbar-32.png"
    },
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/main-world.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true,
      "world": "MAIN"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/profile-bridge.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true,
      "world": "ISOLATED"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "threat-ua-switcher@draghetti.it",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "142.0"
    }
  }
}