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Notify Last Modified Date & time of web page . Get the date from http protocol sended by web server. Sometimes server or browser set current time, so in that case , lastModified date is unreliable to check update the page.

Icons made by Freepik from www.flaticon.com is licensed by CC 3.0 BY

You can choose two notify type. one is javascript alert , another is html popup .
html popup design is customizable, and html popup fade automatically(Don't need click :p ).

FAQ
・Don't show popup html msg.
It might be that popup msg is hidden by page container.
so rewrite z-index value more depth (like 1000 ->99999) in css.
(open this addon option page, then rewrite css property in textarea property of popup)