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)

Install

• License: Mozilla Public License 2.0
• Weekly downloads: 2
• Average daily users: 139
• Rating: 2.6/5 of 10 ratings
• Created: 2018-01-26 06:16:26
• Last updated: 2018-11-28 02:35:07
• Homepage:
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/lastmodifiedinfo/
• API: {0e797091-a410-4546-91e8-65ea1c0419ad}