Firefox 57 / Quantum: emulate print styles

Question

How can I emulate the media type "print" in the new Firefox Quantum dev console?

Tried to enable it somehow and searched the documentation but couldn't find any hints!

Answer 1

[UPD] this console has gone starting from v62. But after some time toggle button for switching into Print mode is available in DevTools again. Please check another answer below(unable to delete accepted answer)

I thought it's impossible. But suddenly have found answer in another topic:

1. press Shift + F2 to get special browser console
2. type "media emulate print"
3. hit "Enter"

That's it.

Answer 2

Print style emulation can be toggled from the styles panel in the Inspector in the Developer Tools. It's in the toolbar at the top of the styles panel, the little page icon (toggled active in the screenshot):

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History

After the GCLI (Developer Toolbar) has been removed, the feature is now once again available in the latest nightly version of Firefox. As of May 2019, this has not yet landed in the current stable release (66), but it is available in the current Developer Edition and the Nightly Channel (68.0a1 and above).

Update August of 2019 (v68)

Version 68 has landed in the stable release channel, so the feature is now available in all Firefox distributions.