Theme not saving after closing browser

I have a Raspberry Pi 4b with an SSD and HassOS. I install HACS and downloaded a couple of themes, which I switched to in my Profile. When I logout and close the browser then reopen the browser the theme has reverted back to the default. I’ve added the necessary lines to my configuration yaml but I’m stumped as to why the theme won’t save. Any ideas? Am I missing something?

I have the same problem, I use firefox and I think it is the setting in firefox.

are you using firefox?