Is there any way to see when prefetching is happening in Firefox? In Chrome there is an internal task manager which shows when websites is being pre-rendered in background is there anything similar for Firefox pre-fetching?
One way to confirm that a resource has been prefetched by Firefox is to load the page that triggers the prefetching and then take a look at the contents of the browser cache by browsing to about:cache and clicking on List Cache Entries.
If you clear your cache just before you do that, it will be pretty obvious whether or not these resources were prefetched successfully.