it's not normal, check your browser console for errors.

Do you mean in the message at the lower left of the window that displays when you hover your mouse over a link? Is nothing displayed, or is the wrong URL is displayed?

Thanks for the replies. I have had a look at the console but I don't really understand the info. As far as I can see, it may be something to do with blocking cookies. If anyone can make head or tail of the reason, you can see what happens by trying to access https://visuteach.com/wp-content/uploads/free_tests/times_tables/2_times_tables_2_E/index.html It works fine with Google Chrome and Edge, but just hangs and fails to display with Firefox.

Sorry, it is locked to the domain, so you have to go to the domain https://visuteach.com and choose Free Tests from the menu and then Times Tables Tests and then try and run any one of those tests

Your site uses window.sidebar which was removed in Firefox 102.

Thank you very much for your help, zeroknight. That was the problem. A reference to window.sidebar appears in the encrypted index.html and it is not in the original unencrypted index.html file