What are the downsides of using a pop-up blocker?

The main drawback of an aggressive pop-up blocker is that it can interfere with payment gateways (like PayPal or banking sites) or legitimate PDF downloads by preventing the necessary windows from opening to complete the process.

AdBlock Network local allowlist

AdBlock Network elegantly mitigates this issue. If a legitimate gateway breaks, you can pause the blocker exclusively on that domain with a single click. For all other sites, the software performs read-only asynchronous requests to multiple independent endpoints to keep the firewall updated, ensuring protection of the Address layer.