How can I save Push-Notifications on a Windows 10 PC

The Push-Notifications of a website are only some seconds on my PC. How can I see them some time after I got them?

Once bug 1497425 and its dependencies are fixed then notifications will show in the Windows 10 Action Center until Firefox is closed.

If any developers want to push that over the line it would be greatly appreciated.

Bug 1497425 - Turn on Toast Notification on release channel. 
(https://bugzil.la/1497425)

MattN