I am unable to display my username when trying to log into 'Udemy' website. Under Logins & Passwords my Username and Password is saved for this site. When I click login button, the username appears momentarily and then disappears from the login screen. I have to manually type the username each time. However, the password is retained and no issues there. Could not find any help articles on this particular problem. Tried unclicking hardware acceleration. Still no change. Other websites appear to function properly except 'udemy'. Is this due to settings in FireFox or something not right with 'udemy' website?