Check this out:
Go to the purple bar on down and pass the mouse on the links quick, repeatedly during 5 or 7 seconds: they disappear.
The link class has a Hover transformation. This is only Firefox issue.
Here is my site Read-Only: https://preview.webflow.com/preview/bakidotesting?utm_medium=preview_link&utm_source=designer&utm_content=bakidotesting&preview=1f9188152e1a3581554f66e3a7f298fd&mode=preview