Mozilla Firefox is very best open source web browser which is contain approximately 28-29% of all browser. It is free and open source browser. The nature of this browser is the reason for people loved it. This browser is very fast browsing speed. And the downloading speed is also very nice. And it can pause and resume your downloading whether you turn off your system then also you can continue your downloading again at same place.
It supports many extension approximately 6000+ and it has more than 500 themes. It has also very good security functionality.
So, friends this is the best browser all over the world.