Cannot get Firefox 16 min-resolution dppx media query to work on retina MacBook Pro

I'm trying to use the new min-resolution dppx media query support in Firefox 16 to work with my retina MacBook Pro, however when targetting the dppx with min-resolution it's not being supported by the browser. Is this actually correctly supported by Firefox now, or is it still outstanding?
Test case is here - I've set it to 1dppx, so as far as I understand the text should be red on any screen (not just a retina one): http://mjw.in/firefox/test1.html

I don't think that 2dppx works in Firefox 16 because a search on MXR with mozilla-release doesn't give any results (1dppx may work).
*http://mxr.mozilla.org/mozilla-release/search?string=2dppx
The current Nightly build may work in case you want to test this.
*http://mxr.mozilla.org/mozilla-central/search?string=2dppx
*http://www.mozilla.org/en-US/firefox/channel/
See this article about how to install multiple versions on Mac OS X:
* http://www.businessinsider.com/how-to-run-firefox-4-and-3-simultaneously-in-mac-os-x-with-multiple-firefox-profiles-2011-3

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Cannot get Firefox 16 min-resolution dppx media query to work on retina MacBook Pro

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