Hello,

You may have seen a post or received a notification regarding support for Firefox or Thunderbird with a link to another site or a phone number being posted. This is a scam and is not a method to receive support from Mozilla. Mozilla does not have telephone or email support. Please do not click on the link and do not interact by calling any phone numbers or email addresses listed. I apologize for any inconvenience caused. You are currently posting on the official Mozilla website and will receive assistance here.

You did install the 64 bit Firefox version ?

Is there a Mozilla Firefox folder present with files in it ?

• (64-bit Firefox) "C:\Program Files\Mozilla Firefox\"
• (32-bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\"

Do a clean reinstall of the current Firefox release and delete the Firefox program folder before installing a fresh copy of the current Firefox release.

• download the Firefox installer and save the file to the desktop
  *https://www.mozilla.org/en-US/firefox/all/#product-desktop-release

If possible uninstall your current Firefox version to cleanup the Windows Registry and settings in security software.

• do NOT remove "personal data" when you uninstall the current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including personal data in profiles created by other Firefox versions

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

• (64-bit Firefox) "C:\Program Files\Mozilla Firefox\"
• (32-bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\"

• it is important to delete the Firefox program folder to remove all the files and make sure there are no problems with files that were leftover after uninstalling

Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you reinstall or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Reinstall Firefox

• https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems

Hi Hundr22, do you use Avast by any chance? Several Avast users are reporting similar problems today, as well as some that might or might not run Avast.

One possible workaround is to move Firefox to a different folder. This may help, but unfortunately I cannot tell you what is going on on your system.

Other Threads

• https://support.mozilla.org/questions/1290476
• https://support.mozilla.org/questions/1290490
• https://support.mozilla.org/questions/1290528 *
• https://support.mozilla.org/questions/1290513
• https://support.mozilla.org/questions/1290534
• https://support.mozilla.org/questions/1290540
• https://support.mozilla.org/questions/1290541

Program Move Workaround

The user in that third thread reported that moving the contents of:

C:\Program Files\Mozilla Firefox

to

C:\Program Files (x86)\Mozilla Firefox

allowed Firefox to run. The user in the second thread reported that worked for them. I don't know why that would make a difference.

The problem was not solved by the new installation. Yes I installed 64 bit (Cor-el).

The solution is to move the folder "Programs" to the Program Files (x86) folder. Firefox now works again! (jscher2000).

Thanks for pointing out the dangerous phone number; I deleted the letter. (Andrew).

Thank You all!!!!

Hi habe schon dreimal Firefox de und instaliert und immer das gleiche Ergebnis fire.exe konnte nicht gefunden werden. habe Windows 10 und kein Avarst am start. Gestern lief alles noch.

mfg

oillinger

See also:

• /questions/1290490#answer-1322261 Windows Cannot Find Firefox.exe

Avast has issued an update for Avast Cleanup that should fix this problem created by their last update: https://forum.avast.com/index.php?topic=234798.0