Hello @arnoudkooi, Did you managed to find a solution for this? I'm trying to solve this for a whole day now. When I send a message with browser.tabs.sendMessage to a tab that I've created it won't receive it at all. No matter if I send it from a different tab or from a background script. It will receive messages send through the browser.runtime.sendMessage though. It feels impossible. I've tried also chrome namespace but with the same results. Is everyone else using browser.tabs.connect API?

oh man, I've used a wrong tag, it should be "Safari Extensions", not system, can some admin change that?