Please try uninstalling the extension and restarting CID. Then install the extension again and see what happen.
Hi Eric,
I tried this with the latest version numerous times, it doesn't appear to install correctly and if you go to Click&Clean options CID freezes to the point that it has be killed off via task-manager.
Looks like a conflict/bug between CID and C&C.
Also check if the extension works on the latest FF for reference.
Sorry I haven't tried this, as I don't currently have FF installed on any system.