Examine source code of OhMyECH - ECH Indicator

{
  "manifest_version": 2,
  "name": "OhMyECH - ECH Indicator",
  "version": "1.5",
  "description": "Add a visual indication whether a site uses ECH (Encrypted Client Hello) or not to the address bar.",
  "icons": {
    "48": "icons/ech.svg"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "page_action": {
    "default_icon": {
      "48": "icons/ech.svg"
    },
    "default_title": "Oh My ECH"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{46b8ab0b-8adf-4e43-ad67-acef5a8d45c9}"
    }
  }
}