As it says on the tin. Product and UX have slated this for removal. This PopupNotification appears to be powered by this code: https://searchfox.org/mozilla-central/rev/eeb8cf278192d68b3977d0adb4d43f1463439269/browser/components/fxmonitor/FirefoxMonitor.jsm#410
Bug 1696550 Comment 0 Edit History
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As it says on the tin. Product and UX have slated this for removal. We shouldn't show this panel if `browser.proton.doorhangers.enabled` is true. This PopupNotification appears to be powered by this code: https://searchfox.org/mozilla-central/rev/eeb8cf278192d68b3977d0adb4d43f1463439269/browser/components/fxmonitor/FirefoxMonitor.jsm#410