Firefox سپورٹ فورم

I received an email suggesting that I update my Firefox or I would lose syncing function. I have two computers. A fairly new iMac Ventura 13.6.8 running Firefox 123.0 64 bit which it says is up to date. But I also have an older iMac OSX 10.11.6 El Capiten running Firefox 78.15.0 ESR. I can't update the OS or Firefox on the old computer. So if I do nothing - will I still be able to sync on the newer Mac. I'm not too worried about the old one - I don't use it much for browsing - more for documents. Thank you. David Rimell

Starting a few weeks ago, firefox would not load any accounts via https://login.microsoftonline.com/ one one of my Macs.

I was running the latest version 121.xx on MAC 12.7.2

Nothing would fix the site issue, so I tried re-installing and refreshing Firefox. Followed all the troubleshooting steps.

Now firefox is completely broken. Tried creating a new profile. Running in safe mode, etc.

It sometimes will load pages, but extremely slow. But generally is unusable.

Firefox works on my other macs just fine (Profile uses sync with those machines)

Safari and Chrome work perfectly fine. No malware. No ISP issues. No firewall.

Please advise a fix or I guess I will delete everything firefox related.

Whenever I go to a Google page (tested on Google.com Docs, Sheets, Forms) the page crashes. The issue started sometime around this afternoon.