Fortigate GUI Problem with Firefox and Adblock Plus

Known to be affected:

• FortiOS 4.0 MR1
• Adblock Plus 1.1.X

If you are running the Adblock Plus plugin for Firefox there are problems when expanding some of the "Advanced" fields in the firewall GUI. In particular

• Router -> Dynamic -> OSPF: The little blue triangle to expand the "Advanced Options" does not display but can be clicked if you know its location
• VPN -> IPSEC -> Auto Key: The "Advanced" option buttons for both Phase 1 and 2 appear but do not expand the GUI when clicked.

The current workaround I found is to simply disable Adblock Plus for a particular firewall.