Path: ...!weretis.net!feeder6.news.weretis.net!feeder8.news.weretis.net!news.imp.ch!news.alphanet.ch!alphanet.ch!.POSTED.lfbn-bor-1-86-40.w90-50.abo.wanadoo.fr!not-for-mail
From: Chris <chxx@pop.free.fr.invalid>
Newsgroups: fr.comp.os.mac-os.x
Subject: =?UTF-8?B?W1FdIFBvdXJxdW9pIEZpcmVmb3ggb3V2cmUgZGV1eCBmZW4=?=
 =?UTF-8?B?w6p0cmVzID8=?=
Date: Thu, 9 Sep 2021 09:10:55 -0000 (UTC)
Organization: Posted through ALPHANET (https://news.alphanet.ch/)
Sender: cdavid33@lfbn-bor-1-86-40.w90-50.abo.wanadoo.fr
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Quand je clique sur un lien contenant une URL, Firefox (mon navigateur
par défaut) se lance et ouvre deux fenêtres : une avec l'URL en
question, l'autre avec la page de démarrage.

Pourquoi donc ?

Merci

iMac (Retina 5K, 27-inch, 2017)
MacOS Big Sur version 11.5.2
Firefox version 92.0 (64 bits)

-- 
Rien ne sert de penser, faut réfléchir avant.