Greetings cmokon,

I'm not a "Tech", nor greatly skilled in "Computers/Browsers", but I do know that if you go to the "Open Application Menu", & then click "Settings", then click "Privacy & Security", that You will find Settings for "Cookies & Data".

Take a look at the "Cookies and Site Data", & You may be able to solve Your problem via the "Manage Exceptions" button.

Here's another possibility:

Firefox's "Total Cookie Protection" feature limits how sites can use "third party" or "cross-site" cookies, meaning cookies from different websites than the one you see in the address bar. Some sites pass you back and forth between different servers during login because they have their services spread out over a number of different servers. In those cases, you might be able to submit a form successfully on one page and then the next page says you are not logged in. Frustrating!

You can make exceptions to this feature when needed (for each server that you visit as part of the process of using this company's services). Try clicking the shield icon at the left end of the address bar (next to the lock). On the drop-down, click the blue slider switch to disable protection. Repeat on the site's other servers as you encounter them.

More info in the following articles:

• Introducing Total Cookie Protection in Standard Mode
• Total Cookie Protection and website breakage FAQ

Any difference?