Examine source code of DOM Time Machine Pro

{
  "manifest_version": 3,
  "name": "DOM Time Machine Pro",
  "version": "1.0.4",
  "description": "A powerful developer tool designed to capture a high-fidelity, chronological record of a webpage's DOM state. Capture, rewind, and inspect the code of a page at any point in time.",
  "author": "scolasti.co",
  "homepage_url": "https://github.com/scolastico-dev/dom-time-machine",
  "icons": {
    "32": "icons/gray.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dom-time-machine@scolasti.co",
      "data_collection_permissions": {
        "required": [
          "websiteContent",
          "browsingActivity"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "activeTab",
    "scripting",
    "tabs"
  ],
  "action": {
    "default_title": "DOM Time Machine",
    "default_icon": {
      "32": "icons/gray.png"
    },
    "default_popup": "popup.html"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "viewer.html",
        "viewer.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}