Since updating to 4.01, I have been receiving the following message after a long period of unresponsiveness by Firefox: this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Script: resource://gre/modules/XPCOMUtils.jsm:257 It seems to resolve itself aster I tell it to stop the script, but this keeps on happening and its is really a bother. Please help.