Why does firefox stop working?

Question

Squid

The point is this.
Set up a squid proxy with kerberos authentication and auto-config via wpad.
Everything is working. The company's default browser is firefox. For some users, the Internet periodically falls off. At all. No sites are opened, even local ones, even by IP address. Tried to change proxy settings (manually, system, auto, no proxy) - to no avail. Only restarting the browser helps.
I tried to watch tcpdump traffic - there seems to be no requests at all.
In what in general there can be a business?

Answer 1

In general, I asked a question on the official forum. It really is a firefox bug. Fixed in version 53.03