For testing only. Test identities only, until MOR is frozen. Two risks, in plain words:

1. Whoever serves this page's code at the moment an identity is made here could copy its keys.
2. This browser's storage, where the identity's signing key is kept, can be lost, or read by what runs in this page.

An identity that is to hold anything of value is made with a downloaded app, or with a chain key kept offline: never here.