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Firefox update to version 13 and Avast! 7 free

  • 4 replies
  • 24 have this problem
  • 4 views
  • Last reply by Djinn

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I updated Firefox to the latest version today, Firefox 13.0. How ever, when the installer was just finished and before Firefox opens up after the update, my Avast! popped up about suspicious behavior about a temp folder. I use Avast! 7 free anti virus, and Malwarebytes. I ran a scan with Malwarebytes before Avast! and it found nothing. It had to be Firefox causing the alert, because Firefox would not open until I allowed it through the alert.

Did anyone have the same problems when updating Firefox if you use Avast! 7 on Windows 7?

I updated Firefox to the latest version today, Firefox 13.0. How ever, when the installer was just finished and before Firefox opens up after the update, my Avast! popped up about suspicious behavior about a temp folder. I use Avast! 7 free anti virus, and Malwarebytes. I ran a scan with Malwarebytes before Avast! and it found nothing. It had to be Firefox causing the alert, because Firefox would not open until I allowed it through the alert. Did anyone have the same problems when updating Firefox if you use Avast! 7 on Windows 7?

Modified by Djinn

All Replies (4)

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does the program have logfiles to see what exactly was going on (which threat was detected & in which file)?

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It was a behavior shield alert when the update to Firefox was done. When I allowed it, nothing was saved of it. I have to stress though, it wasn't a threat detected alert, just suspicious. This laptop's reasonably new and I always take caution as to what websites I have visited. I did ran a scan with Avast! there now and it picked up nothing, so something tells me something in the lastest update of Firefox triggers an alert from Avast for some reason.

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If there are problems with updating then best is to download the full version and uninstall the currently installed version and delete the Firefox program folder to remove any leftover files.

Download a fresh Firefox copy and save the file to the desktop.

Uninstall your current Firefox version, if possible.

  • Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.

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

Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.


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No real problem with updating if it was a false positive with Avast 7 which is what I am wanting to establish. I find it hard to believe my machine is infected, so I think it's only a false positive.