On Sun, 18 Apr 2021 09:46:06 +0100, Chris J Dixon
wrote:

snip

If, using my desktop, on
https://nottinghamplayhouse.co.uk/my-account/ I click on
the silhouette to log in, the popup in Firefox reads "Firefox
can't open this page.


JOOI, it still seems ok on Firefox 52.9 on XP/32 and FF V87 on W10/64
(VM Router in modem mode).

(If you use your link it's already where you would be if you clicked
on the silhouette, eg /my-account/.)

Cheers, T i m