To activate Pipelining, you need to type
about:config on address bar, then double click on the value of "network.http.pipelining" and "network.http.proxy.pipelining" to be true. And then double click on "network.http.pipelining.maxrequests" and enter "8".
Type
about:config on address bar, then left-click on it and choose "New" - "Integer", then enter "content.notify.interval" and click "OK", enter value "500000", and click "OK" again.
Left-click again on the window and choose "New" - "Boolean", and enter "content.notify.ontimer" and set its value to be true.
Type
about:config on address bar, then left-click on it and choose "New" - "Integer", then enter "content.switch.threshold" and click "OK", enter value "250000", and click "OK" again.
Type
about:config on address bar, left-click on the window and choose "New" - "Boolean", and enter "content.interrupt.parsing" and click "OK"