service worker is not in navigator

I am trying to add push notifications to my app to do this I am using service workers. for me everything works correctly on google chrome and Firefox but for my friend it says that navigetor.serviceWorker is undefined. he is using Firefox 94.0.2 (64-bit) that should support it according to mozilla

the site http protocol is https and window.isSecureContext is true

I don't know what is the problem all I see about it is the browser support and the secure window things but all of those are ok.

ill be glad if you will be able to help me :)