Before diving into the solutions, it's important to understand that there could be multiple reasons why you're being kicked back to the login page. The issue could lie with the website's servers, your browser settings, or even your internet connection.

• Clear Cookies and Cache: Sometimes old or corrupted cookies can cause login issues. Try clearing your cookies and cache in Firefox and then try logging in again.

• Update Firefox: Ensure that you're running the latest version of Firefox. Updates often include important security patches and bug fixes.

• Check Add-ons and Extensions: Some browser extensions, like ad blockers, might interfere with website scripts. Disable them one by one to check if any are causing the issue.

• Private Browsing: Try logging in using a private browsing window. If it works, then the issue might be with some settings or data saved in your normal browsing profile.

This usually happens when cookies are cleared by your browser settings, an extension or third-party software.

Does it still happen with all your extensions disabled?