As I understand it the current Windows and OSX browsers are supported. It is only the old ones that are not supported. Third party browsers are recommended, not mandatory.
Also, I think you are using the term "native" incorrectly, but I am not an expert. Native usually means that an application was written specifically for a platform and not ported or emulated. Third party apps can be native in this sense, even if they are not bundled or included by default.