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Version 12 and still no print preview?

It's there, but not yet enabled by default.

If you want to try it, go to about:flags, and set it to enabled.

Aren't they just using the "print to PDF, then show it in the brower" method?

I had it enabled for a while, but it never worked, which was pretty annoying when wanting to print a boarding pass.

Install IE-tab, which will give it to you on the right-click menu. Assumes you are on Windows.