[Fasterfox] this was response by dnsstuff.com

[Access]

FORBIDDEN: Pre-fetching abuses our website.

If you are using the FireFox extension 'FasterFox', it is very poor and will
block you from websites that it abuses. Please uninstall it. If you are not
running it, you are running some sort of poor extension that pre-fetches
pages that it shouldn't (ones without a 'link' marker). Once you have done
this, you can re-load this page. Note that if you do not remove the rogue
program, you will continue to see this message occasionally.

If everyone did this, it could easily quadruple the load on our server.

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