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# Speed. Less cache pressure, less paging, and fewer/smaller GC and CC pauses.
# Stability. Fewer aborts/crashes due to virtual or physical or virtual memory exhaustion. The latter former is mostly a problem on 32-bit Windows buildswith a 2GB or 4GB virtual memory limit, the former latter is mostly a problem on mobiledevices that lack swap space.
# Reputation. Fewer people will complain about Firefox being a memory hog, and fewer people will complain that Mozilla ignores memory usage.
Reducing memory consumption directly helps with both stability and reputation. The effect effects on speed are usually murkier, and the effects depend greatly on the nature of any individual reduction and the machine Firefox is running on; furthermore, changes that reduce Firefox's memory consumption but make it slower are not desirable.
There are two main facets to this:
