It shouldn't be the browser I have tried the test's on both chrome and mozilla and they pretty much gave me the same results. Also the verison speed tests always say I have 25/27, but I know that can't be right since I can't watch live streams that are even at 2500 kbs without it chopping and downloads take ages.
Most recent speedtest: http://www.speedtest.net/my-result/3121667782