Few so far. Personally, I'd rarely want to bother with the foreign-language reviews even if they were easily translatable, as its a frustrating experience trying to decipher the auto-translated versions of them, so I'd rather have them not show by default unless I request it. This fits into a more global request for listal to be personalizable for the country the member is living it. If there was a system for that, each member could *only* see reviews, movie titles, and posters in their language if they wanted.
Do you have any particular recommendations for Firefox addons?