Sounds like NoScript for dummies
Works a bit like NoScript or similar extensions (block scripts unless users manually authorizes or adds the site to a whitelist), so seems like a step in the right direction.
What I can't figure out, and the MS doc isn't clear about this, is how sites are categorized into 'popular', 'unfamiliar', 'less visited'. Is it just based on the user's browsing history (the first time I visit microsoft.com, it will be considered 'unfamiliar'), or does MS maintain a list of more or less visited sites globally? Do they also maintain a list of untrusted websites?