Much the same here 'bouts, but my plugin is PithHelmet.
Initially PH would not load, but the well known/unofficial fix works as advertised, and once again, PH and Safari are as one.
Still, I have been running the new Safari for a very short time, so I had best withhold my final judgment (hardly ever done) for a bit longer.
As always, I caution others to refrain from the bleeding edge unless they have 1, preferably 2, verified backups.
