User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/31.0 Iceweasel/31.1.0 Build ID: 20140903072827 Steps to reproduce: 1. Open http://returnofthejedi.release.kjuicer.com/coolbar.html 2. Move cursor over ellipsis Actual results: Wrong rotation, glichy, blue semiellipsis corrupted, weird images on FF nighly (4th nov 2014). Expected results: 180° rotation. It works correctly with FF 31 on Debian and FF 33 on Fedora.

Regression window(m-i) Good: https://hg.mozilla.org/integration/mozilla-inbound/rev/326c91338df0 Mozilla/5.0 (X11; Linux i686; rv:34.0) Gecko/20100101 Firefox/34.0 ID:20140722220945 Bad: https://hg.mozilla.org/integration/mozilla-inbound/rev/06b540d3667a Mozilla/5.0 (X11; Linux i686; rv:34.0) Gecko/20100101 Firefox/34.0 ID:20140722222448 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=326c91338df0&tochange=06b540d3667a Regressed by: Bug 1042423 - Do css background clipping using DisplayItemClip

User Agent Mozilla/5.0 (X11; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0 Build ID 20151229030216 Tried to reproduce this on Nightly 46. Note that the animation start when refreshing the page, not when the cursor in moved over it. I didn't see any problem with the animation. Could you please check if it's still reproducible on your side on latest Nightly (currently version 46)? If it works as expected we can close this as WFM.

Fixed, both in stable and in nightly :)

Thank you!