Having dug a little deeper it appears that ftp functionality has not actually been
removed in Firefox 88.0 and later although I believe that this functionality will eventually be removed in Firefox 90.
On my own system, having weighed up the security concerns, toggling 'network.ftp.enabled' to 'true' in Firefox's 'about
:config' restores the old behaviour:
Code:
network.ftp.enabled true
Good choice on
my system but may not be ideal on other's systems...