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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.

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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.)

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