Examine source code of Key Pair Generator

{
  "manifest_version": 2,
  "name": "Key Pair Generator",
  "version": "654",
  "description": "Generate Ed25519 and RSA-4096 key pairs directly in the browser using Web Crypto API. Keys never leave your device.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{20834549-a51b-42ac-9fab-0e82d72269a2}",
      "strict_min_version": "96.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "ico/icon16.png",
      "32": "ico/icon32.png",
      "48": "ico/icon48.png",
      "96": "ico/icon96.png",
      "128": "ico/icon128.png"
    },
    "default_title": "Key Pair Generator",
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "16": "ico/icon16.png",
    "32": "ico/icon32.png",
    "48": "ico/icon48.png",
    "96": "ico/icon96.png",
    "128": "ico/icon128.png"
  },
  "permissions": [
    "clipboardWrite"
  ]
}