The title of this post is a statement that Apple itself has been commenting on for a long time. In the last keynote Apple told us that with the improvements implemented in the browser for the next version of OS X, OS X El Capitan, they would get reduce energy and resource consumption of our machine, this already happens today when we use Safari to surf the net.
Many of us continue to use the Apple browser for these reasons (in addition to many others) and now the non-Apple company, BatteryBox, explains in its blog through graphics the difference in autonomy when we use the browser Safari, versus Chrome or Firefox.
It should be noted that this company is dedicated to the manufacture of external batteries and we are sure they understand what they are talking about. The tests have been carried out on a 13-inch MacBook Pro Retina freshly restored from the factory and these are the autonomy results:
You can clearly see the difference between using Safari and other browsers, although sometimes the difference is not so marked. They also explain the tests to perform this comparative: Youtube videos, browsing websites, using social networks, streaming music and using email. Up to 6 hours 21 minutes of total use was taken browsing on the MacBook with Safari, in front of 5 hours 29 minutes Firefox and 5 8 hours and minutes with Chrome.
Anyway, I'm used to Safari, the other thing is that it is optimized for both the OS and the Hardware, therefore I doubt that another browser works better than Safari in OS X