Examine source code of Tab Reuser

{
  "manifest_version": 3,
  "default_locale": "en",
  "name": "Tab Reuser",
  "description": "Specify websites and URLs to always open in an existing tab with the same matching URL.",
  "version": "1.1.5",
  "icons": {
    "48": "images/icon-48.png",
    "96": "images/icon-96.png",
    "128": "images/icon-128.png",
    "256": "images/icon-256.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-reuser@spurpoint.com",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity"
        ]
      }
    }
  },
  "optional_permissions": [],
  "optional_host_permissions": [],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "tabs",
    "webNavigation",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "images/icon-48.png",
      "96": "images/icon-96.png",
      "128": "images/icon-128.png",
      "256": "images/icon-256.png"
    }
  }
}