I tried deleting the cookies and logging in again, and that did not work.

I tried Google Chrome 97.0.4692.77 and it works fine.

https://support.mozilla.org/en-US/kb/websites-say-cookies-are-blocked-unblock-them

Also please check out: https://support.mozilla.org/en-US/questions/1364032#answer-1475084

I had already seen this article: Websites say cookies are blocked - Unblock them

I tried everything. Including clearing all cookies and cache. I also turned off all add-ons. I tried restarting Firefox. I checked after logging into the bank again, and they created 22 new cookies.

The settings did not help either:

firefox keeps blocking 3rd party cookies their settings do not work

Use these links to create a new profile. Use this new profile as is. Is the problem still there?

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder

https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Type about:profiles<enter> in the address box.

So I created the new profile, added the add-ons one at a time, quitting firefox each time, getting in again with the new profile, logging into the bank, and each time it worked. I finally logged into my firefox account, and all my bookmarks are added to the new profile. The banks web site is still working.

It appears that my old profile was called default-release. I had another profile called default, and the new one I created. I have never tried default as far as I know.

One of my add-ons is the outlook notifier, and my company's outlook web server appears to be down, so I haven't tested everything yet.

Is there any point to diagnosing this further?

One of my add-ons is the outlook notifier . . .

If this works, you are all set. You may want to remove the original profile later.