Optimizing Firefox for broadband
Taken from a PC World article…
Type about:config in address bar and press Enter
Type network.http in the filter field
Double-click network.http.pipelining.maxrequests to bring up the "Enter integer value’ dialog box. Enter a higher number than the default 4: try 15. and click OK.
Double-click network.http.proxy.pipelining to set it to ‘true’.
Right-click anywhere on the page and select New Integer. Enter nglayout.initialpaint.delay and then click OK.
Set the integer value to 0 (zero) and click OK again.