Many times when there are website issues, this can be solved by clearing your cookies & cache. It’s a lot easier than it sounds
Open up Firefox and click on the 3 bars in the top right corner. Then click on Preferences.
Click on ‘Privacy & Security’ in the left sidebar, then scroll down a bit until you see the ‘Clear Data’ button.
Check both Cookies and Cache then click Clear.
You can also clear your History by clicking ‘clear history’
Select what you would like to clear and then click ‘ok’.