Clara HD anyone know how to disable the built-in web browser?

Hi,

Just got a Clara HD for my kids to use as a relatively safe reading device that can't hit up arbitrary websites like my tablet can. Then I discovered that it had a built-in web browser. Oops.

Anyways, I'm wondering whether anyone knows how to disable the built-in browser, or even which browser it is?

I'm pretty comfortable with Linux, so that part's no problem. Just want to avoid wasting time poking around.

Thanks a bunch!