compilercreator

There are also technical limitations on Metro apps. For example, JIT compilation is not possible for pure Metro apps because Metro APIs do not allow marking memory as executable.

There are strict limitations on iOS that prevent third-party browsers from getting good performance. For example, third-party applications distributed through the app store cannot do any runtime code generation. This prevents third-party browsers from having great Javascript performance.

Enterprise apps do not have this limitation, but that does not help regular consumers.

No, this version will not run on ARM. This is not a regular Metro app. On x86 systems, Microsoft has made a special exception for third-party browsers to utilize Win32 APIs. So both Chrome and Firefox under x86+Metro are still using their underlying desktop codebase, just with a different UI.

On ARM, only MS apps are allowed to access Win32 APIs.