I am using wimax in Bangladesh. And I was happy with my internet speed and cost. But suddenly I found, my prepaid card is empty in 4 days, where I was using that same card for one month. I tried to find what happened and finally I realize that it is the Firefox. Whenever I started using Firefox browser it is killing my bandwidth. So, now again I am using only Google chrome and budget is going good now. So, my suggestion for all who are using costly internet connection in low bandwidth, use Google chrome for browsing.