CSS3 3D transforms for Carousel aren't used in Firefox

Created by: cvrebert

So, it turns out that the media query we're using (https://github.com/twbs/bootstrap/blob/72a91b0205b3a76baebb68aeac8030fd015d906b/less/carousel.less#L29 ) evaluates to false in Firefox. (Also, the unprefixed transform-3d media feature doesn't seem to exist; there's only -webkit-transform-3d) Testcase: http://jsbin.com/lewuza/5/edit I'm thinking we could duplicate the styles in an @supports feature query, which Firefox does support (again, see testcase).