When Firefox started it unexpectedly working only with stored DNS-server. This is a big mistake of developer of this browser. Why you don't refresh DNS-server with all restart browser? I have local DNS, but not all time I work clearly for my provider, time of time I insert VPN server (like ProtonVPN) and DNS-server has changing. Any another browser's developer understand this and do refresh DNS-server, but firefox developers hardly stored previous DNS address and in FF usually I see screen below. I type google.com, but firefox search DNS server from him previous life and looking up DNS not in current connection in VPN. And second your big mistakes. Do you know anything about timeout and error message about timeout to call DNS?