SecurityError: The operation is insecure

Greetings,

The plugin is working well. Thanks.
Just wondering if this error I see in the Firefox’s Web Developer Console is really insecure…?
SecurityError: The operation is insecure

In facts, I see 4 errors messages which leads me to this source code:

<script type="text/javascript" id="serviceworker">
if (navigator.serviceWorker) {
window.addEventListener('load', function () {
navigator.serviceWorker.register(
"https:\/\/www.mydomain.com\/site\/fr\/?wp_service_worker=1", {"scope": "\/site\/"}
);
});
}
</script>

Thank you