The latest version is available on Mozilla website for all OS except Android. Android users grab your version here. The new version has JavaScrip JIT compiler which Mozilla calls IonMonkey makes web apps and games run 25 % faster as said above. The official changelog also points out to improvement in tab switching performance and HTML scaling algorithm. There are some changes in developer also like DOM property and faster startup time.
The Android version has integration with Google Now and Safe Browsing. Searching has also been made easier in new update.
The only thing missing from the update is PDF viewer which was available in the beta version but somehow is not available in the final version.
Firefox as always will be a hot favorite with the developers and bloggers.
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