Thank you for your review. As of now, a whitelist would be quite annoying to have: currently the extension works by blocking every single tab/window opened from blacklisted sites, and also detecting videos. Blocking every site by default would mean any video would be annoyingly intercepted and any new tab/window would be blocked (even if it's a link clicked by you), unless the website is put into the whitelist.

This is why I'll probably introduce an opt-out option to collect anonymous usage information to create a big global blacklist included by default in the extension. That way, it would work out of the box on most sites.