Firefox cannot access routerlogin.net but Chrome and Edge can - what's wrong?

Hello

I cannot access www.routerlogin.net using Firefox, but on the same machine Chrome and Microsoft Edge can access it.

On Firefox, www.routerlogin.net redirects to this page:

https://www.netgear.com/home/services/routerlogincom.html

Which says I am not connected to my wifi but I can browse the internet and I can also access my HP printer using wifi.

I get this when connected to both the 2.4 and 5 Ghz netowrks on my router.

What am I doing wrong? Is there a Firefox setting I need to change?

My Environment:

R6900v2

Dell XPS 15 9500 (one week old)

Windows 10 64 bit - 10.0. 19042 Build 19042 (up to date)

Firefox 85.0 64 bit - up to date

I tried clearing the Firefox cache (but not cookies - I will lose many logins)

I tried 92.168.1.1 and it did not work either

Thanks for any advice

Maurice Frank