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Okay, quick update:

Apparently, the old OF versions DO get deleted. At any rate, after updating today, there’s only the shell of the old version left in the Applications folder –*an empty application with 0 KB.

Probably a permissions problem. As my user installed the app, everything in it is owned by my user and can be deleted with user privileges –*but the app folder itself needs admin privileges to be deleted, so it isn’t.

That’s how Firefox auto-updates: It doesn’t replace as a whole, but just writes over the contents of No Admin validation is needed.