A bug appears when using Firefox

In Firefox 106.0.5 (64-bit) clicking the icon on a comment to display the reactions results in the whole window being overlaid with a translucent grey. The dialog does not appear. The same translucent grey overlay appears when clicking the Contact link in the footer

Clicking the reacions icon on a post in the feed works correctly.

Both work in Vivaldi.

Why is there no obvious way to report a bug?