Once upon a time, web browsers competed on the basis of rendering performance and quality. Then they moved on to extensions and add-ons. Now it seems that the next arena will be in power consumption. As users become more battery conscious, thanks to a slowdown in battery tech innovation, they will start looking to programs that eat up more battery than they should. Unsurprisingly, Microsoft boasts that its Edge web browser is the most efficient at power management. And in the same breath, points to Google Chrome as the worst.