I'm using Norton Security with the Norton Toolbar 2015.5.2.24 with Firefox 40.0.3, both of which are kept fully up to date. Sooner or later, .Firefox will freeze and become totally unresponsive, except (thank goodness) the exit icon. Restarting Firefox, it will again work for a while and then freeze again.
Disabling Norton Toolbar fixes the problem but defeats the purpose. I had thought these issues were fully resolved. Am I missing something somewhere?