This beta is no longer maintained. No bug reports are possible. It has defects.
Heuristic Network Prefetcher preloads the pages you are about to access.
Images and static content contained inside the pages are also preloaded.
Requires a powerful CPU (i3 or recent) because it performs significant background pre-rendering.
Not all webpages may be prefetched (limited on cross domain reference, different CMS, etc) but thru an average user navigation it provides a noticeable speedup for most of the pages. The add-on selectively determines the pages you are bout to access and prefetches only these
If your internet connection has fixed monthly quotas that you can't overpass, this add-on may not be suitable for you as it performs significant background prefetching.