ServiceWorker is undefined about synapse HOT 6 CLOSED

Sounds like your browser doesn't support service worker. Which navigator/version do you use? (Afaik, the only one not supporting service worker is IE)

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Firefox 98.x

So, this looks like cosmetic then, right?
Probably just need to handle it a bit better to prevent "errors" in the console.

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The service worker registration allows the PWA capabilities. It's more a "futurproof" thing than an actual feature for now. But anyways, we'll indeed prevent the error from appearing.

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@ketseh out of curiosity, were you using Private Browsing Mode when testing? Because I think FFX 98 should support service workers. Or did you serve the page from an unsafe location (http instead of https) ?

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http -- yes
private mode -- no

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Maybe you want to unable 'unsafe' service workers then:

Service workers only run over HTTPS, for security reasons. Having modified network requests, wide open to 
man in the middle attacks would be really bad. In Firefox, Service Worker APIs are also hidden and cannot 
be used when the user is in private browsing mode.

Note: On Firefox, for testing you can run service workers over HTTP (insecurely); simply check the 
Enable Service Workers over HTTP (when toolbox is open) option in the Firefox Devtools options/gear menu.

src: https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API#service_worker_concepts_and_usage

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