NOTE VERY IMPOTANT YOU SHOULD UPDATE YOUR NORTON SOFTWARE BEFORE YOU UPDATE TO FIREFOX 21 The Norton toolbar has been updated to versions 2012.5.14.2 requires a computer restart and for version 2013.3.5.1does not require a computer restart but does require a applied program click on popup . This is for the Firefox 21 release on may 14 2013 NOTEe for more info go to http://community.norton.com/t5/Norton-Toolbar-Norton-Identity/Firefox-21-Support-for-Norton-Toolbar/td-p/957507 Mohan_G posted 1 minute before I posted.