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Add simple notes to the notification area. Click on tray icon, it will show up a dialog where you can input your notification title, message and optionally icon(default will be same as the extension icon). Important: Do not put any information that you would care if lost.
A simple GNOME Shell extension to set your wallpaper to one of WikiArts Artwork of the day with single click! Disclaimer: This extension is not affiliated, funded, or in any way associated with WikiArt.