Im new to DLP and just push DLP to my machine for a test. I noticed after the reboot then open Internet Explorer v9 prompt me to enable or disable the add-in.
DLP version 18.104.22.168
The plugin is needed for Web Post Protection Rules to work. If you are not using this rule, then you may disable the handler in Agent Configuration.
Use GPO to restrict users from being presented with the option to enable/disable plugins in IE.