Monzilla firefox is one of my favorite browsers which have one feature pipelining which really make it really fast than another browser. By default it is disable, so make it enable to get good results.
Enable pipelining and increase pipelining maxrequests
Like in processors pipelines concept is there to fast execution of instructions so processor ultimately execute programs fast. Same concept is used in firefox to get fast result.
Open your firefox browser, type about:config in address bar. Then you will get filter option, type network in filter .then find network.hhtp.pipelining option in below list and make it enable by changing its value false to true. Just below that second option is network.http.pipelining.maxrequests, change its value 4 to 10 to increase pipeline maximum requests.