*(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\" *(32 bit Windows) "C:\Program Files\Mozilla Firefox\" *Do NOT remove "personal data" when you uninstall your current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions.
*Download the full Firefox installer and save the file to the desktop Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox. It is important to delete the Firefox program to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\".(32 bit Windows) "C:\Program Files\Mozilla Firefox\".Remove the Firefox program before installing that newly downloaded copy of the Firefox installer. Do NOT remove "personal data" when you uninstall your current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions.
If possible uninstall your current Firefox version to cleanup the Windows registry and settings in security software.
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