remove previous versions
Firefox should remove previous installations during the upgrade.
if you're looking for silent installation, I can only recommend the Frontmotion MSI (www.frontmotion.com/Firefox)
It's a very good installer that handles upgrades well.
To silently uninstall firefox, run the following command line:
"%PROGRAMFILES%\Mozilla Firefox\Uninstall\Helper.exe" -ms (or -S for older versions of Firefox)
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