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It's possible today. about:flags.

What release are you using and on what OS?

I'm running '11.0.672.2 dev' on OS X and don't see such an option.

o_0 They either removed it, or it's a cr-48 only option. I'd check but it's not around at the moment. Sorry.

It's on every OS but OS X, for whatever reason.

That is frustrating. :(