Examine source code of Spelltable to Google Sheets

{
  "manifest_version": 3,
  "name": "Spelltable to Google Sheets",
  "version": "1.31",
  "description": "Scrape Spelltable deck names and send to Google Sheets",
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "https://spelltable.wizards.com/*",
    "https://script.google.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://spelltable.wizards.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon-48.png",
    "default_title": "Spelltable to Google Sheets"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "oscar@dahlberg.com",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    }
  }
}