Very usefull! Rated 5 out of 5 stars

This is my new favourite add-on! :-)
But I'm afraid I noticed one bug: You can't update Firefox to the new version 3.08 whithout deactivating RequestPolicy...

This review is for a previous version of the add-on (0.5.4). 

Fixed in version 0.5.5

Thank you immensely for reporting this. Version 0.5.5 permanently whitelists requests from to other sites, as those update requests appear to redirect off-site now.