Am 13.09.2016 um 21:56 schrieb Crawford, Roger:
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?
Mozilla recommends to not downgrade, e.g. from 48 to 45.
Because they often include preliminary versions of new features together
with a preference setting to turn it off, such that only beta testers
try it. Then in a later version, when the new feature has been debugged,
they change the default to on. If you now downgrade, you can get the
broken earlier version of the new feature installed, and the preference
setting is now on for existing users, if they ran the newer version at
least once.
Also sometimes Mozilla changes the type of a preference in a
non-compatible way, e.g. from boolean to integer, and later versions
include an automatic conversion. That conversion works only in the
forward direction. The old version will not handle the converted value
correctly, either not run at all, or not honour that setting.
It is safer to do the switch when the next ESR cycle starts.
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