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

Forced to create a new profile upon opening firefox

  • 2 réponses
  • 1 a ce problème
  • 1 vue
  • Dernière réponse par sdvestal

more options

Has anyone found a solution for the following error message that occurs upon opening Firefox "You've launched an older version of Firefox" ? I have tried changing my profile, setting a default profile, refreshing Firefox, and uninstalling and then re-installing Firefox. Even after installing the latest version of Firefox I still get the message that says I am launching an older version. Nothing has worked so far.

Has anyone found a solution for the following error message that occurs upon opening Firefox "You've launched an older version of Firefox" ? I have tried changing my profile, setting a default profile, refreshing Firefox, and uninstalling and then re-installing Firefox. Even after installing the latest version of Firefox I still get the message that says I am launching an older version. Nothing has worked so far.
Captures d’écran jointes

Toutes les réponses (2)

more options

How many profile do you have if you check this in the hidden "AppData\Roaming" location ?


You can check the profiles.ini file to see what Firefox version and installation location last used a profile.

You get the "Using an older version of Firefox can corrupt bookmarks and browsing history ..." message when you try to start Firefox with a profile that has been last used by a newer version. You can possibly bypass this by starting Firefox with the -allow-downgrade command line switch.

more options

This did not work. -allow-downgrade did not help. It yields the message that Firefox is not a recognized program. I currently have 6 profiles in the AppData\Roaming location. Every time I open firefox I have to create a new profile in order to get it to open. The .ini file updates each time with the new profile. Other suggestions would be appreciated.