Examine source code of New Tab - Pocketizer

{
  "name": "__MSG_EXTENSION_NAME__",
  "version": "3.0.2",
  "manifest_version": 3,
  "default_locale": "en",
  "description": "__MSG_EXTENSION_DESCRIPTION__",
  "author": "Gert Glükmann @glukmann",
  "homepage_url": "https://gglukmann.github.io/pocketizer",
  "icons": {
    "16": "assets/images/icon16.png",
    "32": "assets/images/icon32.png",
    "48": "assets/images/icon48.png",
    "64": "assets/images/icon64.png",
    "128": "assets/images/icon128.png",
    "256": "assets/images/icon256.png"
  },
  "action": {
    "default_icon": {
      "16": "assets/images/icon16.png",
      "32": "assets/images/icon32.png"
    }
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "background": {
    "scripts": [
      "assets/js/extension/background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{94b89ca6-23ec-45c0-a648-0f30d5a2f74d}",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "identity"
  ],
  "host_permissions": [
    "<all_urls>"
  ]
}