ISSUE:

Login form submission at https://namecrane.com/login returned "Invalid CSRF Protection Token" error, failing to login me in.

I have seen:
“Invalid or missing CSRF token” message means that your browser couldn't create a secure cookie or couldn't access that cookie to authorize...

SOLUTION:

So After going to Firefox / Settings / Privacy (web page about:settings#privacy ), I have seen that my tracking protection, Cookies option has set "All cookies", which means blocking all. So after switching it to block tracking and isolate cross-site ones, the login form started working with the "Invalid CSRF Protection Token" error.