User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:20.0) Gecko/20100101 Firefox/20.0
Build ID: 20130326150557
Steps to reproduce:
Transition opacity on an image that has transform:scale(0.4) applied.
Note: this only happens if there is a small-enough transform:scale() in play.
The image smoothing during the transition is poor and "fixed" after the transition ended
the smoothing of the image should not be visually apparent.
Possibly related: bug 1024152 and bug 860261.
Also visible in attachment 8550808 [details] (testcase for bug 1122885).
I still reproduce in latest nightly (46 from 20160104030217) on Linux/GTK3.