firefox cannot connect to any website, other browsers can?

[Colin Watson]

On Thu, Jan 13, 2022 at 09:48:57AM +0100, M. Fioretti wrote:
> I am running Firefox 95.01. on an Ubuntu 21.04 64-bit box. All of a
> sudden, for no visible reason, Firefox stopped connecting to any
> website, including some that are surely online, e.g. cnn.com, google,
> etc..
> 
> It is the browser, because on the same box, in the same moment, I can
> connect to the same websites with Tor, w3m, or use email, ssh and
> anything else that uses an internet connection. So, what could it be?

I've heard rumours that disabling HTTP3 helps:

  https://news.ycombinator.com/item?id=29918121
  https://bugzilla.mozilla.org/show_bug.cgi?id=1749908

This is evidently something changed at the server end since it doesn't
seem to correlate with client updates.

-- 
Colin Watson (he/him)                              [cjwatson at ubuntu.com]