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 run because it 'is already running' I have tried all steps in firefox crashes articles

more options

I had a spectacular crash in Firefox (FF) - Malware or a virus - I think my system is clean now. I removed FF and all FF/Mozilla files, downloaded a new FF. It will not run because: "Close Firefox A copy of Firefox is already open. Only one copy of Firefox can be open at a time" I have tried all the remedies on the 'FF crashes' support page. The profile manager doesn't run probably because that was among the files I deleted. All other apps seem to run fine.

I had a spectacular crash in Firefox (FF) - Malware or a virus - I think my system is clean now. I removed FF and all FF/Mozilla files, downloaded a new FF. It will not run because: "Close Firefox A copy of Firefox is already open. Only one copy of Firefox can be open at a time" I have tried all the remedies on the 'FF crashes' support page. The profile manager doesn't run probably because that was among the files I deleted. All other apps seem to run fine.

Toutes les réponses (1)

more options

Start with item #2

  1. close Firefox with File > Exit or "Firefox" button > Exit. Give Firefox some time to close and
  2. check that it finished via Windows 7 shortcut to WTM "Ctrl+Shift+Esc" in the "Processes" tab make sure that firefox.exe is no longer running -- if it is still running then terminate it by selecting the use "End Process" button or from context menu.
  3. proceed with the install