Hacker News Reader

www.reddit.com --> old.reddit.com

This plugin redirects you to old.reddit automatically:

You don't need a plugin, just go to http://old.reddit.com/prefs, scroll to the bottom, and uncheck "Use new Reddit as my default experience"

on ALL of my alts?! Not to mention when I'm logged out. I'd rather click "install plugin" once.

You can accomplish this with HTTPS Everywhere too.