Give an option in enhanced tracking protection to block websites.
1. Block a website with all the urls so example.com but also example.com/food
2. Block website with all the .??? So block example.com but also example.to , example.ru and etc.
3. Built-in automatic block websites that contains viruses or other bad things that can harm you like malicious and phishing websites.
I know you have add-ons/extensions to do this but 1. They are not always working. 2. Not everyone knows about those add-ons. 3. Not everyone trust add-ons because they need access to some stuff to let it work. 4. Not everyone wants or are interested in using add-ons at all.
I think this is a useful feature for a browser like firefox.