User Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:25.0) Gecko/20100101 Firefox/25.0 (Beta/Release) Build ID: 20131025151332 Steps to reproduce: I launched the http://codepen.io/juliangarnier/pen/idhuG demo (3D solar system in CSS) on both Firefox and Chrome. Actual results: There was some visible flickering when the Earth passed in front of the Sun on Firefox, while this animation was perfectly smooth on Chrome. (BTW, this flickering prevented the author of the demo from delivering its fantastic http://tridiv.com/ CSS-based modelling tool on Firefox.) Expected results: No flickering should have been visible on Firefox... Thanks in advance for your attention!

Is that the same flickering I registered on the yellow cube on http://tridiv.com/ ?

Thanks Loic for the quick feedback! Yes, I think that the flickering I described previously (see also the video I just uploaded, in attachment) is the same flickering we are observing on the yellow cube you mentioned. (By the way, the full source code of the Solar System demo is available on Codepen.io)

Thanks Mats. See my comment for the bug 936376. Thanks in advance!