Examine source code of SuperStart New Tab Page

{
  "name": "SuperStart New Tab Page",
  "description": "A New Tab Extension that lets you create a customized Start Page Experience",
  "version": "1.2.1",
  "author": "SuperStart",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox@superstart"
    }
  },
  "action": {
    "default_title": "SuperStart"
  },
  "minimum_chrome_version": "104",
  "icons": {
    "48": "assets/images/icon48.png",
    "128": "assets/images/icon128.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "unlimitedStorage",
    "sessions"
  ],
  "host_permissions": [],
  "optional_permissions": [
    "topSites",
    "bookmarks"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "chrome_settings_overrides": {
    "homepage": "index.html"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}