ExtensionManagement.registerSchema("chrome://browser/content/schemas/bazquux.json");
=== Permission strings ===
The strings for permissions can be found in [https://dxr.mozilla.org/mozilla-central/source/browser/locales/en-US/chrome/browser/browser.properties browser.properties].
If you add an API that requires permissions, then you'll need to make sure the corresponding permission strings are also landed.