Examine source code of Covvet

{
  "manifest_version": 3,
  "name": "Covvet",
  "description": "Get sale alerts on the things you want.",
  "version": "2.4",
  "browser_specific_settings": {
    "gecko": {
      "id": "@firefox.covvet.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    }
  },
  "background": {
    "service_worker": "js/service-worker.js",
    "scripts": [
      "js/service-worker.js"
    ]
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "19": "icons/icon19.png",
      "38": "icons/icon38.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "save.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}