I emailed a reply "yes", and then phoned her. By now she had got Chrome installed as her default browser.
In conversation I said that "Any public online system that depends on one browser is a stupid system" or words to that effect.
Banking, Airline reservations, Libraries, News sites, Massive stores, Eileen's Lounge etc. If anyone tells you that their site works ONLY with Chrome, or only with the LATEST Firefox, or only with any other browser, then they are talking rubbish.
In the end it turned out that these online courses were put on by hubby's firm, so I figured that (a) the Help desk was reading from a script ("Clear your cache, run Windows 11, ...") or (b) they were so cheap that they had hired someone like Chris Greaves who doesn't have a clue about setting up web sites.
What's your take on this. Do you know of ANY public sites that run truly with only one specified browser??
Thanks, Chris