Even tho the default is supposed to be popup blocker enabled it will not stay enabled. I check the enable box every time I start Firefox as it is never enabled by default and very often during a session I will start getting popups(most annoying is NETFLIX) and I will then find the box unchecked and will have to recheck it to block again. This happens in all versions of Firefox I have used so I suspected malware or a virus. So I have run three malware scanners and maintain my anti-virus up to date and find no malware on the machine , any suggestions as to why it will not stay enabled to blockwould be appreciated. Thank You