Local files can't be opened anymore, this functionality is deactivated since a while now but with an invalid reason. The message is "In new FireFox this feature is not available anymore: For security reasons, in Firefox, this may not be a privileged URL. So passing any of the following URLs will fail". But when we copy the address and paste it firefox addres bar, it opens the file without any trouble.
Служба підтримки клієнтів працює на UserEcho