Examine source code of Add to GiftList Button

{
  "name": "Add to GiftList Button",
  "short_name": "Add to GiftList Button",
  "description": "Add to GiftList Button",
  "version": "1.9.0",
  "manifest_version": 3,
  "background": {
    "scripts": [
      "./background.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./content.bundle.js"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_icon": {
      "16": "/images/logo_16.png",
      "32": "/images/logo_32.png",
      "48": "/images/logo_48.png",
      "128": "/images/logo_128.png"
    },
    "default_popup": "index.html"
  },
  "icons": {
    "16": "/images/logo_16.png",
    "32": "/images/logo_32.png",
    "48": "/images/logo_48.png",
    "128": "/images/logo_128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "identity"
  ],
  "host_permissions": [
    "https://admin.giftlist.com/api/*",
    "*://*/*"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; script-src-elem 'self' 'unsafe-inline'; frame-src 'self' https://extension-offsrc-auth.web.app https://apis.google.com https://www.gstatic.com https://www.googleapis.com https://securetoken.googleapis.com https://connect.facebook.net https://www.facebook.com *.walmartimages.com adclick.g.doubleclick.net drfdisvc.walmart.com *.quantummetric.com tap.walmart.com www.facebook.com www.recaptcha.net wallet.walmart.com tpc.googlesyndication.com *.online-metrix.net www.google.com *.vimeo.com vimeo.com identity.walmart.com wallet.walmart.com *.affirm.com *.eko.com *.shopstylecollective.com ln-rules.rewardstyle.com *.babylist.com cdn.cs.1worldsync.com cc.cs.1worldsync.com ws.cnetcontent.com ccsprodus1.blob.core.windows.net salsify-ecdn.com www.ezdia.com *.countr.one *.onefinance.com *.buywith.com wrd.walmart.com *.talkshop.live wss://api.talkshop.live"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{386e3dc1-550c-4add-ad86-5c2c822e9001}",
      "strict_min_version": "109.0"
    },
    "safari": {
      "strict_min_version": "16.4"
    }
  }
}