My DD had a kindle fire for Christmas. She likes watching videos on it. She watches children's programmes, so I'm fine with that (I have the time limiter on her account), but I wanted to put a block on any adult content that she might access (inadvertently, she's pretty trustworthy). I can only see how to block web access altogether, but I wanted something more nuanced than that. Is there a setting, or failing that an app that does the job? Many thanks!