Don’t believe there’s a switch; our SCCM package checks these two reg locations 
for the current version installed, and runs an uninstall first if there’s not 
an exact match to the package’s target version:

HKLM\SOFTWARE\Mozilla\Mozilla Firefox ESR\CurrentVersion
HKLM\SOFTWARE\Mozilla\Mozilla Firefox\CurrentVersion

From: Enterprise [mailto:enterprise-boun...@mozilla.org] On Behalf Of Crawford, 
Roger
Sent: Tuesday, September 13, 2016 12:56 PM
To: enterprise@mozilla.org
Subject: EXT: [Mozilla Enterprise] Uninstall before ESR Install?

It’s probably dirt simple and I’m missing it but…Wouldn’t be the first time.

Trying to package ESR 45.3 into a SCCM 2012 package, have that all functional 
and installs like a breeze – on a machine with no install or lower than 45. 
Higher than 45 it sees the newer version and calls itself successful due to 
versioning and bails.  Is there a Firefox CFG switch that allows the overwrite 
of a newer than 45.3 version since public is at 48 and change or do I need to 
script in an uninstall before proceeding with the ESR install?

I can’t be the first to run into this I’m sure!

Thanks!


Roger


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