You can check the about:policies#active page to see whether policies are active (63+). see screenshot

   https://support.mozilla.org/en-US/kb/see-active-policies-firefox-enterprise 

May as well check this also.

https://support.mozilla.org/en-US/questions/1318442

And this...

https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

Just to verify... you have tried this right?

https://www.psea.org/

I think that block message is a feature of your network and not a feature of Firefox.

When I test, there are 3 redirects:

Request #1: get http://psea.org Response #1: address changed to https://psea.org

Request #2: get https://psea.org Response #2: address changed to http://www.psea.org

Request #3: get http://www.psea.org Response #3: address changed to https://www.psea.org

Request #4: get https://www.psea.org Response #4: (page loads normally)

Nothing here worked so far. Regarding network blockage, I have Vipre installed but I shut it down and that did not work. Only thing left would be Comcast/Xfinity router but I am not sure how to fix that.

Firefox has multiple ways to look up website addresses, including asking Windows and going directly to Cloudflare or Google. You might take a look at your current DNS over HTTPS setting and try a different one to see whether that makes any difference:

Firefox DNS-over-HTTPS

Thanks for all the help. Turns out it was my hard-wired Ethernet connection that was crapping out. It got even worse as the day went on. I am running on WiFi and am looking at purchasing a new computer since this one is 7 years old. Again, thank you for the feedback.