I think this is because of the IBM CCK Plugin
Please try this....
In your firefox browser, select "Tools->Add-ons" and see if
there is an IBM CCK plugin. If you find it and it's enabled, please
disable it and restart the browser and then try. I am sure things
will work fine after that. If not, do let me know. On my system,
I have disabled it and it should show up this way after disabling it.