[ryohey]

Thank you! Timer related behavior may be a problem. I will investigate more.

[httgp]

It could be because Firefox reduced time precision to fend off fingerprinting and timing attacks. To turn it on, you’d need to set the Cross-Origin-Opener-Policy to “same-origin” and the Cross-Origin-Embedder-Policy to “require-corp”. Reference — https://developer.mozilla.org/en-US/docs/Web/API/Performance...