Oops, too late for me. I updated via the App Store yesterday. Safari AdBlock no longer works, nor does Rapport for my banking sites.
I checked the App Store for replacements and can't see anything free. I thought about trying to replace Safari from a backup, but didn't bother as I rarely use Safari, anyway.
iMac (19,1, 3.1 GHz i5, 10.14.6, 40 Gb RAM) with Mac Pro (5,1, dual-2.4 GHz, 10.13.6, 24 Gb RAM) used as a server and to run 32-bit apps via Screen Sharing. MacBook Air (1.8 Ghz, 8 Gb RAM, 10.14.6, 256 Gb SSD) all patched through a Vodafone 4-port Home Hub and BT Wi-Fi Extender.