Spam-free search per Jed Laundry

Google used to provide a feature where you could remove domains from search results. Unfortunately they don't do that, and more and more "archive" sites have started popping up, spamming the first page of results.

This extension replaces the default Google search with one that has -site: appended, to remove these domains from results.

I welcome PR's for the domain list: https://github.com/jlaundry/spamfreesearch