Playground does not work in insecure contexts

[joshunrau]

Consider replacing crypto methods with something else:

https://developer.mozilla.org/en-US/docs/Web/API/Crypto/randomUUID

[thomasbeaudry]

To give context / a reminder for this issue - if you have a playground being hosted on a machine behind a firewall (e.g. http), and try to access it via another machine on the network, the crypto function will cause the playground to crash.

[gdevenyi]

Does this work for self-signed contexts?