''adobe flash 10.3 hangs firefox on closing'' That may or may not be current the current version can be checked at * http://www.adobe.com/software/flash/about/ *: looks like everybody will need to update now (I had 10.3.181.34 and the current is now 10.3.183.5 for all systems) :and you might want to check your other plug-ins (link can be found in about:plugins) the ones found for you at * http://www.mozilla.com/en-US/plugincheck/ :and also check out Problematic extensions *http://kb.mozillazine.org/Problematic_extensions