From IRC: cshields: catchpoint is telling us that it is getting 404's on https://www.mozilla.org/media/img/sandstone/bg-gradient-sand.png),url(/media/img/sandstone/bg-sand.png Rik: cshields: do you have a referer for those 404s? cshields: Rik: the responsive css is where that came from
Might be related to bug 795409
Commits pushed to master at https://github.com/mozilla/bedrock https://github.com/mozilla/bedrock/commit/7f3c0f04d47260230d4ea1af8435444fc08703b6 Use CSS long-hand for simple 1-image backgrounds for IE 6/7/8 and CSS short-hand to override that with nice two-background for modern browsers (Bug 797366) https://github.com/mozilla/bedrock/commit/b4784af0fe1d9077cd9e2d67228ec1074fe96f15 Merge pull request #393 from sgarrity/bug-797366-ie404 Fix bug 797366 - 404 when IE tries to parse multiple background images
This has been pushed to production.