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i was looking up for such a add ons and finally found this but it does not work fine in firefox 9. i cannot add any thumbnail when i click to add a thumbnail, unfortunately it will freeze. it does not work good at all.

Cette critique est pour une version précédente du module (1.4.2). 

Thank you for your review. It should work fine in Ff 9. May be there is a conflicting extension installed?