Impossible to access the website addons firefox, all other websites works

impossible to access the website addons firefox, all other websites works.
Almost all pages of mozilla get the same message!
Impossible to add troubleshooting informations too!
I get this message.
Firefox ne peut trouver le serveur à l'adresse addons.mozilla.org.
Veuillez vérifier la syntaxe de l'adresse (saisie de ww.exemple.com au lieu de www.exemple.com par exemple) ;
Si vous n'arrivez à naviguer sur aucun site, vérifiez la connexion au réseau de votre ordinateur ;
Si votre ordinateur ou votre réseau est protégé par un pare-feu ou un proxy, assurez-vous que Firefox a l'autorisation d'accéder au Web.
ALL OTHER WEBSITE WORKS
-I reinitialize firefox
-I check my firewall and antivirus
-I empty the cache and cookies
try everythings...
Thank you for help me quickly
Murielle

Nothing happend.
I have the same problem on Chrome.
Only for the website Mozilla, even cant access the download page!

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