Pretty sharp. I like the preview toggle - seems to me that keeping the preview visable all the time like other editors is a waste of space.
Since it saves to Chrome local storage, wouldn't notes get synced along with other Chrome data?
I'm actually just using IndexedDB so it doesn't sync. I use Chrome storage to cache the license (in case you were wondering about the permissions). There is a special Chrome storage sync api but it's limited to 800kb I think. I'm still exploring a good way to implement (unlimited) sync. Thanks for the feedback!