Turning off Microsoft Edge - Continue running background apps when closed

Microsoft today (Jan 15, 2020) launched its new Edge browser based on Google's Chromium open-source project. You can download Chromium Edge GA now for Windows 7, Windows 8, Windows 10, and macOS directly from microsoft.com/edge in more than 90 languages. 

One setting you may miss, but has performance implications is found in the System option (edge://settings/system).

Continue running background apps when Microsoft Edge is closed

Some apps and extension can “ask” the browser to stay awake so that they can continue to function; e.g., to deliver notifications of new e-mail messages, or keep a chat alive.

For example, Facebook can continue to run in the background and also show notifications.

Swipe left to disable.