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It's not a telemetry bug. It's a networking bug. Avoiding it basically comes down to being extremely lucky.

Yes, the bug was in the Telemetry code. I'm not sure if it's on by default, but it's probably better to disable it for any large-scale deployments. Both to prevent things like this and to make sure that things that should be disabled by default actually are.

Ah, that explains it. Thank you. I recommend https://ffprofile.com/ which was posted earlier here on HN. Makes it easier to deploy Firefox with saner defaults.

You know I moved from Netscape 3.0 Gold to later versions, to Mozilla, to Phoenix, Firebird, and then Firefox. I tried other browsers but it's always a subpar experience for me. My only gripe is that they kept changing the UI.

(FYI: The bug was not in the telemetry code, it was in the http3 code; see comments further up in the post for details.)

It was broken for a couple of hours, and late at night in the Americas. You might have been asleep for the entire duration of the outage.