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How can I disable the 'Try the new Safari' notification?

In which I remind myself how to get rid of that pesky notification
Published2021-08-31
Tagsmacossafarisoftware

This question was trending on Hacker News but the thread in question never addressed it.

Buried down in the comments was a technical fix suggested by torstenvl.

Safari has a few configuration entries accessible via defaults read com.apple.coreservices.uiagent.

While I haven’t tested this personally, torstenvl recommended stubbing out the notification with the following commands:

defaults write com.apple.coreservices.uiagent CSUIHasSafariBeenLaunched -bool YES
defaults write com.apple.coreservices.uiagent CSUIRecommendSafariNextNotificationDate -date 2050-01-01T00:00:00Z
defaults write com.apple.coreservices.uiagent CSUILastOSVersionWhereSafariRecommendationWasMade -float 99.99

If this works for you, let me know. I’m currently running the macOS Monterey beta at the time of writing and as I’ve already used Safari, I don’t believe I get this notification anymore.