Reminder
only for the very few of you using K-M with a local proxy (e.g. Proxomitron)
Since K-M (like other browsers as well) handles a local proxy like a normal server you may want to slightly modify xGrind's macro accordingly.
# INCREASE MULTI-THREADED DOWNLOAD PERFORMANCE
setpref(INT, "network.http.max-connections",60);
#setpref(INT, "network.http.max-connections-per-server",32);
# INCREASE MULTI-THREADED DOWNLOAD PERFORMANCE using a Local Proxy
setpref(INT, "network.http.max-connections-per-server",60);
setpref(INT, "network.http.max-persistent-connections-per-proxy",16);
setpref(INT, "network.http.max-persistent-connections-per-server",8);