According to Mozilla, “It’s summer intern season and our Firefox for iOS Engineer intern Tyler Lacroix pulled out all the stops this month when he unveiled the results of his pet project – making Firefox faster. In Tyler’s testing, he saw up to 40% reduction in CPU usage and up to 30% reduction in memory usage when using this latest version of Firefox. What this means is that users can get to their Web pages faster while seeing battery life savings.”
That being said, it should be pointed out that this will probably differ from user to user in real-life. This is because there are many things that can cause a battery to drain faster than it should, such as enabling background app refresh, location services, push notifications, and so on. This means that while the new build of Firefox should improve your battery life, you might not necessarily be seeing the same numbers as reported by Mozilla.
In addition to the speed and battery improvements, Mozilla has also updated it to make its menu easier for navigating, switching between search engines, recovering closed tabs, and so on. The latest build should be available from the iTunes App Store, so hit it up for the download if you haven’t done so already.