User Agent: Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1573.2 Safari/537.36 OPR/17.0.1232.0 (Edition Developer) Steps to reproduce: Use -moz-os-version media query like this : >@media (-moz-os-version:windows-win8) { >//specific rules >} Actual results: The media query didn't work Expected results: The media query should work. You should either provide another value windows-win8.1 or make -moz-os-version:windows-win8 work for Windows 8.1.

Not sure if this is related or not, but the User Agent string reported by Firefox running on Windows 8.1 contains "Windows NT 6.2", not "Windows NT 6.3" as Internet Explorer 11 does. For example my User Agent string right now is: "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0"

It's Opera Developer user agent. I can't sign in with persona on Firefox.

Yeah I think we can blend these two together. Looks like all we need to do is add WIN8_1_VERSION to the case statement here - http://mxr.mozilla.org/mozilla-central/source/widget/windows/nsLookAndFeel.cpp#431 Tim, do you want to pick this up?

Is it okay like this?

Comment on attachment 8377221 [details] [diff] [review] patch working as expected.

Rich, your patch needs an updated checkin message, it's missing the approval flag from me.

(In reply to Jim Mathies [:jimm] from comment #7) > Rich, your patch needs an updated checkin message, it's missing the approval > flag from me. Ryan normally adds it on check-in.

From the Australis perspective, we don't need to uplift this for our 29. If you think it's important to uplift, please change the fx29 status and request approval on the patch.

(In reply to :Gijs Kruitbosch from comment #11) > From the Australis perspective, we don't need to uplift this for our 29. If > you think it's important to uplift, please change the fx29 status and > request approval on the patch. Well, the only impact if this is not uplifted is that tree list items (such as the ones in about:config), will have the aero styling on Windows 8.1.

Can we uplift this to mozilla-release for a possible chemspill related to the multiple bugs about unreadable background tabs (bug 1004576 for example)?

Comment on attachment 8377221 [details] [diff] [review] patch [Approval Request Comment] Regression caused by (bug #): need windows8.1 compatibility for theme support User impact if declined: bugs such as bug 1004482 Testing completed (on m-c, etc.): been on 30 and 31 for some time now Risk to taking this patch (and alternatives if risky): none expected String or IDL/UUID changes made by this patch: none

We will uplift this patch if we decide to do a 29.0.1 release with bug 1004482 fixed. Until then, we won't approve this patch.

It is still unclear how much effect bug 1004482 (or bug 1004576, which it got duped to) will have when it comes to helping these cases in the wild, as that bug looks to only affect people who have slid two of the sliders to extreme values. We know that the patch in this particular bug though is of particular concern to *anyone* running Windows 8.1 that switched their machine to use a slightly dark theme, even without any extreme tweaking of colors.

Comment on attachment 8377221 [details] [diff] [review] patch We are going to take this for a non-urgent 29.0.1, please land to m-r asap.

reply to Jared Wein [:jaws] (please needinfo? me) from comment #16) It's a problem if you set Windows in High Contrast mode and don't tweak any settings. We should confirm that this bug fixes those users (although it'd surprise me if it doesn't).

Hmm, false alarm :( Seems like this is not a regression, since the regressed bug ID is not provided.

Reproduced with Nightly from 2013-08-20: with the attached testcase, -moz-os-version media query is not working with Windows 8.1. Verified as fixed with Firefox 29.0.1 (Build ID: 20140506152807) and Firefox 30 beta 2 (Build ID: 20140505140302) on a Microsoft Surface Pro 2 device running Windows 8.1 64bit, Windows 8.1 x32 and Windows 8.1 x64: Mozilla/5.0 (Windows NT 6.3; rv:29.0) Gecko/20100101 Firefox/29.0 Mozilla/5.0 (Windows NT 6.3; rv:30.0) Gecko/20100101 Firefox/30.0 Mozilla/5.0 (Windows NT 6.3; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0 Mozilla/5.0 (Windows NT 6.3; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0 If I change the High Contrast on Windows 8.1, both x32 and x64, I get this: http://goo.gl/t5H2mp. :Cww, is this what you were describing in comment 18?

Crap, I posted in this bug and meant to post in bug 1004576.