Safari does not support 2020 Census or Norton

Now checked if there is a Mojave update to Safari - YES! After completing the update the Census 2020 form could be completed.

Yes, the problem (or at least one problem) is you have the utterly useless Norton 360 installed. Macs DO NOT need any AV software installed. There are, literally, no Mac viruses to detect, and they will not do a single thing to stop you from installing the many Trojans you can download and install.

Get rid of any AV software you have installed. Never install such garbage again.

Are you using a router with your Internet connection? If so, all modern router's have a firewall built in. There's no need to have the Mac's firewall enabled. It has nothing to do when you're already behind the router's firewall.

I have Safari 13.0.5 running on Catalina and I just did my 2020 census online without any problems. Perhaps the reason you are having trouble is related to the fact that you are using antivirus software. It's not necessary on Macs.

Uninstall your third party apps that claim to protect, manage, clean, etc.

Also do no use any "cleaning", "optimizing"or "speed-up" apps? All they do is compromise the performance of the system and apps.

I'm also running Catalina and had no issues completing the Census. I'm also not running software to detect things that don't exist.

I'm running Mojave OS and answered several questions but at the start of personal questions Safari shows this message: "For security reasons, this session has been terminated.

Every response is important. Please try again using a different browser or device."

What is up with web developers that they can't create Safari compatible websites and online forms?

No Norton on my laptop.

Mel1984 wrote:

Now checked if there is a Mojave update to Safari - YES! After completing the update the Census 2020 form could be completed.

You had a different issue than that od the originaltor of this thread.