Examine source code of TorrentRelay

{
  "manifest_version": 3,
  "name": "TorrentRelay",
  "version": "1.0.1",
  "description": "Download torrents and magnet links straight to your device via TorrentRelay.",
  "browser_specific_settings": {
    "gecko": {
      "id": "torrentrelay@torrent-relay.com",
      "strict_min_version": "121.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo"
        ]
      }
    }
  },
  "permissions": [
    "contextMenus",
    "storage",
    "downloads",
    "notifications"
  ],
  "host_permissions": [
    "http://localhost:3000/*",
    "https://torrent-relay.com/*",
    "https://www.torrent-relay.com/*",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "common.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "TorrentRelay",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ]
}