I too have been having the same problem for the past few weeks: adding/updating anything from scribblehub.com fails with 403 error. The site is perfectly visible and functional in a web browser on the same computer--immediately before giving a link to FFF and after it fails--but it seems that FFF cannot get a valid page back from any address in the domain.
Tried changing the user_agent string, but still got the 403 error. Also tried messing with the sleep settings like Atherton25 suggested, but this also had no effect.
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