We could reduce the work we do when matching revalidation selectors at the expense of some complexity, see bug 1354895 comment 10. I'm personally skeptical that this is worth it, but we could certainly measure how hot selector revalidation is, and how often we get through all the style sharing steps and fail during revalidation. Bug 1354965 is similar.
status-firefox57=wontfix unless someone thinks this bug should block 57
status-firefox57: --- → wontfix
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