I was curious about the ActiveState account creation process and whether that simply required an email address, for identification and confirmation purposes, or if it also wanted phone numbers, credit card details, date of birth, and such like. I followed the "ActiveState Perl" link in "Perl Download" (Mac OS X section) and was presented with:

This site is blocked due to a phishing threat.

www.activestate.com

Phishing is a fraudulent attempt to get you to provide personal information under false pretenses. ...

Sorry, www.activestate.com has been blocked by your network administrator.

Given I'm running this from a Win10 platform, I also tried the "ActiveState Perl" link in the Windows section: I got the same result.

Just for completeness, I tried the link with the same name from the Unix section. This time I got:

Warning: Potential Security Risk Ahead

Firefox detected a potential security threat and did not continue to www.activestate.com. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details. ...

I did notice that the URLs in the Mac OS X and Windows sections had http:, while the one in the Unix section had https:. I copied the address from the Mac OS X section link, pasted it into a fresh tab, and added an 's', i.e. http: changed to https:: I now get the same result as I did for Unix (above).

Obviously, that's not a very encouraging start. I had no such issues with the "perl via brew" link that you posted.

I'm running Firefox 74.0 (64-bit) and have been for some time without any problems. I downloaded a newer version late yesterday but need to restart to complete the update. I'll advise if that makes any difference.
Update (Firefox version): I now have Firefox 74.0.1 (64-bit). I retried everything mentioned above: no change.