Continual 'Try the new Safari' prompt

[CooperBox]

With a plan to possibly sell my MBPro10,1 (was running Mountain Lion superbly) I recently upgraded to Mojave 10.14.6. Ever since I'm continually being reminded by a pop-up prompt to 'Try the new Safari'. Only choices given are 'later' or 'try now'.
Having always used Firefox (or more recently the truly excellent WaterFox web browser), I've never being interested in Safari, and that will remain the case.
Is there any way I can free myself from that pesky Safari pop-up message, apart from bowing to Apple's forceful desire to 'try now'?
Fwiw, 10.8 MLion was a splendid OS, and although many will be ecstatic about Mojave, it doesn't get me overjoyed, and even the thought about going to Catalina, well.........

 

[bogdanw]

See "How do you turn off the “Try the new Safari” notification?" https://apple.stackexchange.com/que...-turn-off-the-try-the-new-safari-notification
and https://pastebin.com/itX14Y80 Maybe try a combination of the two:

defaults write com.apple.coreservices.uiagent CSUIHasSafariBeenLaunched -bool YES
defaults write com.apple.coreservices.uiagent CSUIRecommendSafariBackOffInterval 999999999
defaults write com.apple.coreservices.uiagent CSUIRecommendSafariNextNotificationDate "2114-01-01 00:00:00 +0000"

I use Safari and this is how my com.apple.coreservices.uiagent looks:

defaults read com.apple.coreservices.uiagent
    CSUIHasSafariBeenLaunched = 1;
    CSUILastOSVersionWhereSafariRecommendationWasMade = "10.14.6";
    CSUIRecommendSafariBackOffInterval = 259200;
    CSUIRecommendSafariNextNotificationDate = "2019-11-27 12:36:32 +0000";

Firefox has to many critical vulnerabilities for my taste https://www.mozilla.org/en-US/security/known-vulnerabilities/firefox/