I regularly used mozilla untill chrome was accessible.Talking about mozila, it loads very slowly not much functions are there.
Unable to add many new extensions which can be added in other browsers.Its not user friendly since till date I was unable to find the theme changing option.
You wont be able to understand its many features in fact I feel it doesnt have many, Every time it comes up with new versions but no improvement in speed Many sites do not get easily open.Loading time is high.
In the worlds of 4G I cant stay with mozilla, guyz go for other browsers & increase you speed with lovely themes.