iMacros is a great simple tool to automate repetitive web activities on FireFox. I have created a macro to send friend request for AdLandPro community. I have got over 700 friends within short time. I have also created another macro to add users to your network on del.icio.us. This is available here: http://forums.digitalpoint.com/showpost.php?p=3437729&postcount=573 It's pretty simple but powerful tool.