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

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer. 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.Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software. If there are problems with updating then best is to download the full version of the Firefox installer.ĭownload a fresh Firefox copy and save the file to the desktop. Custom installation of Firefox on Windows.What to do if you can't download or save files.

What does 'The download cannot be saved because an unknown error occurred' mean?.

Trying to upgrade from Firefox 3 to Firefox 4.

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