I'm currently looking for a plugin or script that can help me implement popunders for internal traffic trading across my own network of websites. Ideally, I want it to function similarly to how PlugRush works, where a second site opens in a new tab or window behind the main one, helping to circulate visitors between sites. I've been trying to build something myself, but I'm running into issues during testing. When cookies are enabled, it seems like the script won't trigger correctly or only does so once. But if I disable cookies, it ends up opening the popunder every single time the page reloads, which is obviously not ideal. I'm trying to find a balanced, functional solution—any suggestions?