Open up Mozilla Firefox and in the addressbar type (without quotes),"about:config" and hit enter.
It should bring up a page of strings, Intergers, and Boolean settings.
Note: If a string/interger/boolean does not exist then you will need to create the value by right clicking in a blank area of the screen.
Note: Find the individual entry in question by copying the whole name into the filter area in the about:config screen (minus thecomma and the value behind the comma).
Change these settings first - no matterwhat (common to all configurations):
network.http.pipelining, true
network.http.proxy.pipelining, true
network.http.pipelining.maxrequests, 8
content.notify.backoffcount, 5
plugin.expose_full_path, true
ui.submenuDelay, 0

Change these settings if you have a fast computer, fast connection:
content.interrupt.parsing, true
content.max.tokenizing.time, 2250000
content.notify.interval, 750000
content.notify.ontimer, true
content.switch.threshold, 750000
nglayout.initialpaint.delay, 0
network.http.max-connections, 48
network.http.max-connections-per-server, 16
network.http.max-persistent-connections-per-proxy, 16
network.http.max-persistent-connections-per-server, 8
browser.cache.memory.capacity, 65536
Change these settings if you have a fast computer, slower connection:
content.max.tokenizing.time, 2250000
content.notify.interval, 750000
content.notify.ontimer, true
content.switch.threshold, 750000
network.http.max-connections, 48
network.http.max-connections-per-server, 16
network.http.max-persistent-connections-per-proxy, 16
network.http.max-persistent-connections-per-server, 8
nglayout.initialpaint.delay, 0
browser.cache.memory.capacity, 65536

Change these settings if you have a fast computer, slow internet connection:
browser.xul.error_pages.enabled, true
content.interrupt.parsing, true
content.max.tokenizing.time, 3000000
content.maxtextrun, 8191
content.notify.interval, 750000
content.notify.ontimer, true
content.switch.threshold, 750000
network.http.max-connections, 32
network.http.max-connections-per-server, 8
network.http.max-persistent-connections-per-proxy, 8
network.http.max-persistent-connections-per-server, 4
nglayout.initialpaint.delay, 0
browser.cache.memory.capacity, 65536

Change these settings if you have a slow computer, fast internet connection:
content.max.tokenizing.time, 3000000
content.notify.backoffcount, 5
content.notify.interval, 1000000
content.notify.ontimer, true
content.switch.threshold, 1000000
content.maxtextrun, 4095
nglayout.initialpaint.delay, 1000
network.http.max-connections, 48
network.http.max-connections-per-server, 16
network.http.max-persistent-connections-per-proxy, 16
network.http.max-persistent-connections-per-server, 8
dom.disable_window_status_change, true
Change these settings if you have a slow computer, slow connection:
content.max.tokenizing.time, 2250000
content.notify.interval, 750000
content.notify.ontimer, true
content.switch.threshold, 750000
nglayout.initialpaint.delay, 750
network.http.max-connections, 32
network.http.max-connections-per-server, 8
network.http.max-persistent-connections-per-proxy, 4
dom.disable_window_status_change, true