1. Installed Win 7 pro from retail box copy (clean install)
2. Purchased Bitdefender Antivirus Plus 2013 3PCs / 2 years
3. Installed, updated and auto-piloted the product
4. Installed Firefox 21.0
It totally blocks addons in Firefox. Do not even try to tell me something else is the cause of addons being blocked, because you would be wrong. This is a clean install.
How do I get Antivirus Plus 2013 to stop interfering with Firefox addons?
