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As it turns out, this first setting is artifically low on the presumption you'll be using a public proxy
on the Internet and that it's "bad etiquette" to send such a server too many connections.
Being that I'm not going to kick myself off my own proxy server, I went ahead and changed this.

The second setting just reflects what's already been configured in ATSallows for more connections per server, with the assumption ATS will process these in parallel.

network.http.proxy.max-persistent-connections-per-proxy user_set integer 256
network.http.max-persistent-connections-per-server user_set integer 32 128

Experimental

This setting I've had no end of annoyance finding documentation for.  I believe it has to do with predictive HTTP parsing, and the default is pretty low.

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