Is domain blocking working for you or are you using some other extension? Domain blocking mysteriously disappeared for me a while ago. It was a real buzzkill when the likes of Experts Exchange, W3Schools and Quora started showing up in my search results again.

It moved but you can still do it.

https://www.google.com/reviews/t

Well that link works but the filtering doesn't... If I search for "Javascript" W3Schools is top result despite the fact I blocked it.

You are right, it does seem to be broken :(

https://productforums.google.com/forum/#!topic/websearch/N72...