1) Launch Firefox.
2) On your address bar type ''About:Config'', then hit enter.
3) In the Filter type Network.
4) Then scroll down to the middle and look for ''network.http.pipelining''
5) Double click on False to make it True.
6) Look at the next line and double click on the number, change it to 100.
7) Quit Firefox.

Launch Firefox again and enjoy!

Works for me!
