It absolutely does not. Reverting to 3.x and disabling updates seems to be the way to go.
4.x's behaviour on FF 52 is as follows: - all userscripts are gone (they're still in the sqlite storage but GM 4.x does not acknowledge them) - "new script" does nothing -- You received this message because you are subscribed to the Google Groups "greasemonkey-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/greasemonkey-users. For more options, visit https://groups.google.com/d/optout.
