The idea for this extension is to duplicate the behavior of many operating systems that notify you when you have caps lock on during sing-in. This occurs from time to time and seems helpful each time.
Since most web applications do not implement such alert natively, adding the behavior as a feature in Chrome browser seemed like a practical solution to achieve the desired behavior.
NOTICE - this initial release uses declarative content to detect password fields meaning the field has to be present in the HTTP response for the extension to activate in the tab. Obviously this approach will not work with single-page and other dynamic type apps. This limitation may be addressed in later versions depending on demand.