Build Identifier: http://hg.mozilla.org/integration/mozilla-inbound/rev/bcfb0d973c06 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0 ID:20131107220445 Sometimes, it is drawn properly after browser focus switched. Steps To Reproduce: 1. Open URL 2. Click "GRID" (for example) 3. Rotate by mouse dragging --- observe, z-order become wrong 4. Switch window focus to another window(Ex. Ctrl+Shift+B) and back to browser --- observe, z-order corrected 5. Rotate by mouse dragging a little --- observe, z-order become wrong Actual Results: z-order is wrong. Expected Results: Render properly

Perhaps it's the same underlying problem as in bug 936043?

Yes Mats, I agree, in bug 936043 it definitely looks like a z-buffer problem (or the CSS 3D equivalent of a z-buffer). Surfaces are popping in front of one another apparently randomly. In graphic boards, this is often caused when one does not take into account the limited precision of 32-bit floating point numbers while computing some distance-related parameters. Thanks in advance for your help!

or duplicate of bug 689498?