I have to manually uninstall Firefox and manually install the update every time. I asked a similar question before. The response was to start in safe mode. BUT the program will not start. It acts as if there is a software switch set to "don't run this program under any circumstance." The switch is either in the registry or among the program files, because these both get cleared on a manual uninstall. The update procedure is not clearing the registry or the program files. Does the update process uninstall the previous version and then install the update version? Part 2 -- I often cannot find the update manually on the Firefox site. I am on the Beta release channel. The current release is 33.0 beta 4. However, the most recent on the site is beta 3. Where is 33.0 beta 4? OS is Windows XP latest release.