Examine source code of OpenGraph Sniffer MHL

{
  "manifest_version": 3,
  "name": "OpenGraph Sniffer MHL",
  "version": "1.0.0",
  "description": "Exposes page OpenGraph or Twitter Card tags, and lets you easily copy any of the metadata or thumbnails.",
  "author": "Marcin Orlowski",
  "homepage_url": "https://github.com/MarcinOrlowski/opengraph-sniffer-mhl",
  "browser_specific_settings": {
    "gecko": {
      "id": "opengraph-sniffer-mhl@marcinorlowski.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "img/icon.svg",
    "96": "img/icon.svg"
  },
  "permissions": [
    "clipboardWrite",
    "downloads"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "lib/scan.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "lib/scan.js",
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "page_action": {
    "default_icon": {
      "19": "img/icon.svg",
      "38": "img/icon.svg"
    },
    "default_title": "OpenGraph Sniffer MHL",
    "default_popup": "popup/popup.html"
  }
}