Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Ce site disposera de fonctionnalités limitées pendant que nous effectuons des opérations de maintenance en vue de vous proposer un meilleur service. Si un article ne règle pas votre problème et que vous souhaitez poser une question, notre communauté d’assistance est prête à vous répondre via @FirefoxSupport sur Twitter, et /r/firefox sur Reddit.

Rechercher dans l’assistance

Évitez les escroqueries à l’assistance. Nous ne vous demanderons jamais d’appeler ou d’envoyer un SMS à un numéro de téléphone ou de partager des informations personnelles. Veuillez signaler toute activité suspecte en utilisant l’option « Signaler un abus ».

En savoir plus

Firefox won't launch

  • 1 réponse
  • 1 a ce problème
  • 13 vues
  • Dernière réponse par cor-el

more options

When I try to launch Firefox, I get an error message that Firefox is running but not responding and buttons to Close Firefox or Cancel. Closing Firefox results in a pause, then the error message reappearing. When I monitor in Task Manager, I see 2 Firefox processes. One closes when I click Close Firefox, then reappears before the error message reappears. If I close both processes before launching Firefox, two new processes appear with the error message. I can't open Firefox in troubleshooting mode. I have uninstalled and reinstalled, still can't launch.

When I try to launch Firefox, I get an error message that Firefox is running but not responding and buttons to Close Firefox or Cancel. Closing Firefox results in a pause, then the error message reappearing. When I monitor in Task Manager, I see 2 Firefox processes. One closes when I click Close Firefox, then reappears before the error message reappears. If I close both processes before launching Firefox, two new processes appear with the error message. I can't open Firefox in troubleshooting mode. I have uninstalled and reinstalled, still can't launch.

Toutes les réponses (1)

more options

You can check for issues caused by a corrupted or incomplete Visual C++ installation that is missing runtime components (Redistributable Packages) required by Firefox, especially VCRUNTIME140_1.dll.

See "Visual Studio 2015, 2017 and 2019":

You may also have to install the Visual Studio 2013 Redistributable Package. You need to reboot the computer.