Revert "defer icons + screenshots everywhere, fade-ins and less janky redraws"

This reverts commit da8a5d61132dbb62d91c546cf5fc85cd6ad4c8a2.
Revert "defer image loading on search listing (bug 898320)"

This reverts commit 828cc13362faf2d0fd0b816ef3acd58f7f60659b.