You could get a step closer to that and integrate it into your DNS: https://github.com/StevenBlack/hosts

The upside is that it would go beyond your browser to anything on your machine that makes a DNS request.

> Another great function (not for this plugin) should be the option to "bundle" all search results from the same domain. Stuff them under one collapsible entry.

That would be really cool. Just zip it up if you don't want to see that domain for that specific search.