While developing in flash/flex you sometimes want to delete your shared objects settings, of course you can always access to the flash player settings, in adobe..
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager06.html
But sometimes you need something more “local”, so searching in the internet I found this firefox extension to delete the flash shared objets settings
It’s still in development but its working, so give it a try.