uBlock origin is a great extension that I personally use. It accomplishes the same goal when configured with the "block outside intrusions to lan" list, but that wasn't always the case. Back when I first created port authority in March 2021 uBlock didn't have a LAN list.
This extension spurred conversation within the community which eventually led to them adding it in November 2021, which I think is pretty cool!
https://github.com/uBlockOrigin/uAssets/commits/master/filters/lan-block.txt?after=8f1450b968e3f8eae79e9aec3f89474ea265bf86+69
The benefit of port authority is the notifications and UI surrounding which portscanning and lexisnexis requests were blocked.