in the dimdim web meeting publisher setup once you
double click on the installer (after download) pl use
Firefox every where and not firefox.
Logged In: YES
"Dimdim web meeting publisher version 184.108.40.206 is required. Starting the installation process. This might take a few minutes.
Please accept the firefox extension installation by clicking on 'Install Now'.
After the plugin installation is completed please restart all instances of firefox browsers and reconnect to dimdim"