Examine source code of GiftList

{
  "manifest_version": 3,
  "name": "GiftList",
  "description": "Add items from any store to your Gift List",
  "version": "1.1.5",
  "icons": {
    "128": "images/icon_128.png"
  },
  "action": {
    "default_icon": "images/icon_19.png",
    "default_popup": "index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/jquery.js",
        "js/purify.js",
        "js/content.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage",
    "identity"
  ],
  "host_permissions": [
    "https://mygiftlistapp.com/api/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{91188de4-6656-47ae-8df6-4ded9bb7d69e}"
    }
  }
}