You've got mail!

Works like it's supposed to.
I'd like to see configurable options like Reddit Notifier had and a selection of icons for the toolbar button.

Even works with old.reddit.com

This extension works really well with my reddit notifications!

Great for telling "at a glance" if you have messages waiting without having to open tab.
Blue antenna means "not logged in" so it can't check.
Orange for messages waiting.
No color (clear) for no messages
Very nice. No issues.