As of right now, you can only save notes locally to your own machine. However, the team behind the Extension is working to bring Cloud functionality into the swing of things. This will allow you to sync your Notes with services such as Diigo, Dropbox, box.net, Google docs, and Evernote.
Quick Note is simple to use. It loads instantly, as a notepad should. It boasts one-click access to all of your Notes, instant search to find what you need and the ability to add something new right within the app or via a right-click menu.
What note-taking/keeping program or app do you use?