There is a significant startup speed optimization that Firefox 4 doesn't yet do. This optimization is hard to integrate into Firefox, so I'm releasing this functionality as an addon so people can benefit from it while we figure out how to properly integrate it into Firefox. Think of this as a work-in-progress technology preview
This addon bypasses the Windows prefetch feature to start Firefox faster (see Prefetcher - Wikipedia, the free encyclopedia
). It adds a 'faster firefox' shortcut to the Desktop which should launch Firefox up to 2x faster than without this addon.