Forum: newly impossible to login using Firefox.

Just a feed-back:
Using Firefox it becomes sometimes impossible to sign-in, upon selecting Sign-in it just loops to the same page and never gets into the login page.
It looks like it would come from the server, an hour later it works again.
Using Edge, it works always.

I noticed this behaviour many times, today again.
I had no problems with other websites.

No file or test is named. Start by checking whether the forum sign-in loop still reproduces in Firefox and compare the same flow in Edge; done means identifying why Firefox intermittently fails to reach the login page and confirming the fix across both browsers.

Written by the indexing model from the issue text.