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For quite some time, Chrome and Firefox have had that little checkbox on alerts, stopping the site sending any more.

For quite some time, Safari has had this option (though I don't know for how long). Too bad it doesn't work.

That is the parent poster’s point. If Safari were patched independently of the operating system, issues like this could be addressed independently of monolithic system updates.

Safari _is_ updated independently in OS-X.

Maybe this update coincided close enough to the roll out of the OS update that it was included in this release.

Security patches don't count.

Major bug and minor patch can go together. Often a problem has big consequences but a small fix, and that's likely the case here.