Open your Firefox browser and type about:config then press enter
- Once, you will be confirmed to tweak your firefox,
2. Click the button I’ll be careful,….
3.In the filter bar type network.http.pipelining, the value field should be set true, you can do it by double-click it.
4.Next, in the filter bar type network.http.pipelining.maxrequest . Double click this field and set its value to 8.
5. In the filter bar type network.http.proxy.pipelining . Double click this field to set the value field become true.
6. Right click on about:config window (for apple user ctrl+click) select new and then click Boolean
P.S: I got this tips from www.pctipsbox.com, I just tried it and it works like a charm