Adobe Flash
I have Mojave installed on a late 2012 27" iMac, running Safari 14. Do I still need Adobe flash?
iMac Line (2012 and Later)
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Probably not. I haven't had it installed for years.
Also see: https://www.adobe.com/products/flashplayer/end-of-life.html
and
https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html/