Revert "Try -moz-filter"

This reverts commit cfa1ae66312ded3be9be5290f4ad40663dc5cf47.
Potential fix for Safari img border-radius
Revert "Potential fix for Safari img border-radius"

This reverts commit 56d47c2591a44ef3409c7e501a27eb47e0ec1f86.
Much more subtle border