DNS prefetching is indeed in FX3.5+ Rated 3 out of 5 stars

Prefetching is enabled by default, though it is likely not identical in function to what Chrome does. The setting to disable is not present unless manually added. https://developer.mozilla.org/En/Controlling_DNS_prefetching

This review is for a previous version of the add-on (2.0.1-signed.1-signed).