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By the way, on January 13, 2022, around 6:00 p.m., the article linked above was updated as follows.
Update 6 p.m.: Mozilla has since released a statement about the problems: “Earlier today, Firefox experienced a technical glitch due to a cloud provider changing the default settings, triggering a Firefox HTTP/3 bug. We’ve disabled the configuration change and confirmed that this fixes the issue.” Users who are still experiencing problems should restart their browser.
Since the article was a bit vague on this point, I wrote in my first post that the article stated that Mozilla had reported the problems as solved on Twitter and that after a reboot the problems should accordingly no longer occur. Unfortunately, the German word Neustart is somewhat ambiguous. It can mean both reboot and restart. Only the updated version of the article made it clear to me that Neustart did not mean a reboot of the computer, but a restart of the browser. Translating can be tricky now and then.
[Edit:]
Update:
The error that caused Firefox to fail has been fixed by Mozilla and is said to be due to a case sensitivity error.
Mozilla: Firefox-Fehler von Groß- und Kleinschreibung ausgelöst - 2022-01-14 - Golem.de
[Edit 2:]
Update:
With Firefox 96.0.1, Mozilla has fixed the bug in the Firefox code that caused this problem. Mozilla is already working on a further improvement for an upcoming update, so that Firefox does not end up in an infinite loop again even if such an error occurs.
[Edit 3:]
Update:
Two possible causes of crashes have been fixed, as well as the possibility of the HTTP/3 implementation code entering an infinite loop under erroneous circumstances.