https://techcrunch.com/2018/12/06/mozilla-and-qualcomm-are-bringing-a-native-version-of-firefox-to-windows-10-on-arm/

Microsoft is working with Google to bring a native ARM64 version of Chrome to Windows 10 on ARM and as Mozilla announced today, it, too, is working on bringing a native version of Firefox to Windows 10 on ARM. The organization is doing so in cooperation with Qualcomm.

Typically, to make any Windows 10 application run on ARM-based machines, Microsoft uses a number of emulation techniques. Those work quite well, but they do incur both power and performance cost. Native applications obviously don’t need emulation, so they run faster and more efficiently. Given that browsers are among the most-used applications, it’s no surprise that the major browser vendors are interested in offering the best support for the platform, even if we’re still talking about a very small niche for the time being.