Firefox is a Web browser that is smaller, faster, and in some ways more secure than the Mozilla browser from which much of its code was originally derived. Compared to Internet Explorer, the most popular Web browser, Firefox gives users a cleaner interface and faster download speeds.
With greater CPU usage comes faster processing and smoother performance. However, this comes at the expense of the battery battery life. Firefox after all isn’t very slow and therefore is better since it consumes little battery yet still is fast.