Examine source code of e2encrypt

{
  "manifest_version": 3,
  "name": "e2encrypt",
  "version": "0.1.0",
  "description": "End-to-end encryption layered over messaging platforms you do not control.",
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "scripting",
    "activeTab"
  ],
  "optional_host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "e2encrypt.k@rlo.dk",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}