Steps to reproduce:
1) Navigate to http://hsivonen.iki.fi/html5-lecture/2011/sintel.webm
The background image has a checkered texture that causes banding at most zoom levels.
Expected the default background not to have a texture that interacts badly with scaling algorithms.
I can reproduce this on Nightly (10/17).
The patch in Bug 376997 includes a fix for this issue.
The fix included in bug 376997 was moved to the patch for bug 700856 which has been pushed to the fx-team repo.