Done. Hope it is helpful the way I organised my issue there. I have included a zip of the generated Xcode project for testing purposes on your side... feedback ID: FB15343962 (Error: Invalid call to runtime.connect(). No runtime.onConnect listeners found.) https://feedbackassistant.apple.com/feedback/15343962

Hi, It's done for updated zip Xcode project. Nothing special about add-on web APIs(Privacy Policy popup on Options page), that could trigger such error on Safari (whereas Ok on Chrome/Firefox on macOS). The only diff. is the already published have been built and tested with previous (not up to date) version of macOS (Monterey v12.7.6 / Xcode (v14.2 - 14C18) / Safari (17.6 - 17618.3.11.11.7, 17618). BTW, I will also upload a Xcode project zip made on this previous MacBook Air ! Thanks.

Nice, with only first suggestion it's working again on Safari. Thanks for support !