My default browser is Google Chrome; however, I also use Mozilla Firefox for some tasks. Firefox has Norton Password Manager and Norton Safe Web extensions installed and enabled; however, when I try to access the Password Manager, it takes me to the Norton Account login screen and will not accept my password. I also tried going directly to https://login.norton.com/ and I get the same error - it won't accept the password.
I am using Windows 10 Pro 64-bit (Build 19043.1195), with 32GB RAM, using a wired Ethernet connection (VDSL). I cleared the cache in Firefox and that had no effect. My login works quickly from Chrome. During this testing, I only had the two browsers open and no other applications running (except there are background processes running in Windows).