Examine source code of Containers New Tab

{
  "manifest_version": 3,
  "name": "Containers New Tab",
  "version": "0.1.3",
  "description": "Create and edit containers and open sites in containers in your new tab.",
  "browser_specific_settings": {
    "gecko": {
      "id": "containers-new-tab@shotor.dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "contextualIdentities",
    "cookies",
    "tabs",
    "storage",
    "topSites",
    "proxy",
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "type": "module"
  },
  "chrome_url_overrides": {
    "newtab": "src/index.html"
  },
  "chrome_settings_overrides": {
    "homepage": "src/index.html"
  },
  "icons": {
    "48": "assets/icon-48.png",
    "96": "assets/icon-96.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data: https:;"
  }
}