[arch-general] Firefox-71.0-1 breaks WhatsApp Web

[Oon-Ee Ng]

After more investigation and travelling back and forth, it appears the
issue had at least 2 roots. One is that the update process somehow broke my
existing profile. A new profile solves that. The second is that the latest
version of firefox seems to not be able to authenticate with an NTLM proxy
specifically for web.whatsapp.com.

This has happened before -
https://bugzilla.mozilla.org/show_bug.cgi?id=1536787 shows almost identical
behaviour to what I am experiencing. However I was not using Firefox at
that time. Perhaps I'll just switch back to Chromium for whatsapp web.