Conclusion of: firefox cannot connect to any website, other browsers can?

[M. Fioretti]

On Thu, Jan 13, 2022 09:06:06 AM +0000, Colin Watson wrote:
> 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.

Hello list, and thanks to everybody who answered. I have read the
whole thread only now because yesterday, right after posting my
request, I had to leave my desk to take care of family matters.

In my case, the problem disappeared by itself the SECOND, or maybe
third time I quit and restarted Firefox, restarting it once did not do
anything (still running version 95.01). 

For the record, I have noticed that yesterday the same problem was
signalled, almost simultaneously, on the Fedora list, where somebody
eventually posted the same (AFAICT) solution as Colin above, that is:

> If anyone need to fix it, please open "about:config" in a new tab.
> Search : "network.http.http3.enabled"
> change to false, then restart firefox.

> Other workaround: Go to preferences -> Firefox Data Collection and
> uncheck everything. Then restart Firefox

me, I have not done anything like that, because I read that message
only after restarting Firefox as said above. My
network.http.http3.enabled is still "true", I changed nothing in "Data
Collection", and FF connects. Mysteries of software.

	     Marco
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