Not infrequently I cannot connect to the Avast Forum. The problem goes away after closing Firefox ESR, present version 75.8, and retrying.
I am presented with the following message by Firefox:-
[b]Secure Connection Failed
An error occurred during a connection to forum.avast.com. PR_CONNECT_RESET_ERROR
The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
Please contact the web site owners to inform them of this problem.[/b]
I do not see this with any other web site. It seems to be a forum.avast.com speciality.