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I did some research as to why this isn't enabled by default and really couldn't find any good reasons.
Apache Traffic Server supports this, and I got a roughly 100% speed boost by enabling it.
I also dropped the folks at Mozilla a line and suggested they support this.

network.http.pipelining.ssl user_set boolean true
network.http.proxy.pipelining user_set boolean true

NOTE: As much as you'd like to enable "network.http.pipelining" specifically, and it seems to be the right thing to do,
it's not. it is unfortunately buggy.
I'm guessing this exposes internal bug(s) within Firefox, but if that setting is enabled images
from both
Facebook and Twitter start to go missing. Bummer.

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