You can't have IE in Kid's Corner (the guest mode) so you'll want UC Browser as an alternative. There are also alternative phone dialers since you can't have the default phone dialer in Kid's Corner.
Windows 8 explicitly blocks the installation of any browser other than Internet Explorer (+ skins) on ARM. This is not due to a technical reason. This is due to the fact that Microsoft imitates Apple's policy that prevents any browser other than Safari (+ skins) on iOS [1]. While anti-trust rulings have forbidden Microsoft from doing this on PCs, Microsoft claims that ARM-based computers are not PCs and that the anti-trust rulings therefore do not apply. I therefore suspect that Microsoft will continue with this behavior unless a court of justice decides that ARM-based computers are also PCs. Hence my above comment.
And if anyone wonders why we need open platforms for mobile devices, that's a pretty good reason.
One source among many: http://www.linuxstall.com/microsoft-blocks-chrome-and-firefo...
[1] Yes, technologically speaking, Chrome for iOS is a reskinned Safari bundled with utilities.