I had a similar bad habit of mindlessly visiting sites I consider time sinks from the browser. I learned I could edit my hosts file to override the DNS lookup f

I had a similar bad habit of mindlessly visiting sites I consider time sinks from the browser. I learned I could edit my hosts file to override the DNS lookup from a comment on HN. Just be sure to cover variants of the url you wish to block, otherwise if you're anything like me you'll start prepending 'www.' to bypass the block.