Thanks to Squize at Tales From the Code Front I was pointed to a tip on how to block popups that are snuck into firefox via flash.
Pretty handy. If you need to let a specific site use this technique (for security purposes) Just add that site to your whitelist.
To edit your whitelist I think you just need to:
Goto Tools Options
Choose Web Features
Click on the button “Allowed Sites” by block popups
Enter the site url
- Click Allow