This is surprisingly much better, and more functional than Google's own Keep extension on Chrome. All Google Keep features are available in it, allowing me to take note when I'm browing without having to go to Keep website.
This is a great add-on. However: I had no issues with it until after last FF update. Now it has issues with the cookies and won't log in even though other tabs have the account logged on. When I try to log in manually, it delivers a message error about changing cookies settings. I tried by deleting cookies history and refreshing several times, to no avail.