Examine source code of tabme

{
  "manifest_version": 3,
  "name": "tabme",
  "version": "2.1",
  "description": "Save open tabs into bookmark collections and manage them from a custom start page.",
  "permissions": [
    "bookmarks",
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "https://script.google.com/*",
    "https://script.googleusercontent.com/*",
    "https://docs.google.com/*"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "chrome_settings_overrides": {
    "homepage": "newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@tabme.hento",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "bookmarksInfo",
          "websiteActivity"
        ]
      }
    }
  }
}