Examine source code of Hide eBay Listings

{
  "manifest_version": 3,
  "name": "Hide eBay Listing",
  "version": "0.2.1",
  "description": "Selectively hide individual eBay listings; they stay hidden across visits.",
  "author": "Harsha Vardhan",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hide-ebay-listing@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "*://*.ebay.com/*"
  ],
  "optional_host_permissions": [
    "*://*.ebay.co.uk/*",
    "*://*.ebay.de/*",
    "*://*.ebay.com.au/*",
    "*://*.ebay.ca/*",
    "*://*.ebay.fr/*",
    "*://*.ebay.it/*",
    "*://*.ebay.es/*",
    "*://*.ebay.nl/*",
    "*://*.ebay.ie/*",
    "*://*.ebay.at/*",
    "*://*.ebay.ch/*",
    "*://*.ebay.be/*",
    "*://*.ebay.pl/*",
    "*://*.ebay.com.hk/*",
    "*://*.ebay.com.sg/*",
    "*://*.ebay.com.my/*",
    "*://*.ebay.ph/*",
    "*://*.ebay.in/*"
  ],
  "background": {
    "scripts": [
      "src/domain-registry.js",
      "src/background.js"
    ],
    "service_worker": "src/background.js"
  },
  "options_ui": {
    "page": "src/options.html",
    "open_in_tab": true
  }
}