If the spec for this is well thought-through, complete and has gone through the proper process.... then we should do this ASAP. It gives Authors simple tools for greatly improving the performance of their sites, and will result in Firefox being faster.
Bug 1542784 Comment 9 Edit History
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If the spec for this is well thought-through, complete and has gone through the proper process.... then we should do this ASAP. It gives Authors simple tools for greatly improving the performance of their sites, and will result in Firefox being faster. I'm also getting many, many requests for this feature — and questions about when we are shipping it. Authors are eager for it.