Thanks for filing this bug. I tried out the URL http://www.uhrzeit.org/ on my Nexus 4; I zoomed in and scrolled and the billboard kept rotating through the three offers and the timer still kept going fine. I tried this out on Nightly (03/04) and Beta (Fx-20). As you mentioned this happens sometimes, I haven't see this thus far. It would be good to know if you see this using Nightly (http://nightly.mozilla.org) for Android.
I tried Nightly (03/04) and just had the same problem again. It was working for one or two days without any problems, but now it happened again... I think this is device specific, as my brother, who is using a HTC One X, never had this problem...
I just wanted to inform you that after upgrading to android 4.1.2 this problem still exists...
This sounds like something on the gecko side is not driving the compositor as it should be. When the user pans (and shortly after) we drive the compositor from java to paint the newly visible content and fade out the scrollbars, so that's why the animations animate. Maybe layout/graphics people will have a better idea of where animations are supposed to be triggering redraws and driving the compositor.
Component: Graphics, Panning and Zooming → Graphics
Product: Firefox for Android → Core
Version: Firefox 20 → 20 Branch
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