The only functionality right now is to clearly identify what AMO server you are on and let you switch between that page on others.
Add your own dev server by going to about:config and creating the pref extensions.whereamo.devurl with the domain but no trailing slash, like "http://localhost/addons"
What's New in This Release:
· Fixes problem for Remora and sites that aren't as fast to be document.ready
· Support for dev sites via extensions.whereamo.devurl pref