Hi. I am facing the same issue: webRequest.headersReceived returns frameId !=0 for top frame. is it a bug? are you guys planning on solving it? please share with us your thoughts so we know if to put effort in developing workaround for the issue.

Hi all, same issue here. I have signed the safari extension with dev certificate and notarized properly. the extension does not run until I allow "allow unsigned extensions". this is crucial, and really blocking us. any workaround guys?