in bug 1321707 we found that moving a skip-if after a fuzzy-if allowed the test to be skipped properly. This might be an odd interaction with other test flags, for example this discovery is from reftest-unaccel-1, and I saw other examples of this working on plain reftests. I would like to determine what order of operations we have issues with and either fix the manifest parser, or fix the manifests so there is no misleading prior art.

You might be interested in discussion in bug 1346692 comment 2.