Out of the blue, I'm seeing multiple instances of
Code:
Vector smash protection is enabled.
in Console, mostly for Safari 5.1.10, which I use almost exclusively, but also for Firefox 40.0.

I've never seen it before, and a Google search turned up nothing.

Anybody?

Thanks.

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In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire