Problems with adding Belgium eID PKCS#11 module in Firefox
 

I'm trying to install a security device, the ACR38U Smart Card Reader,
in Firefox 5. By the way, I downloaded Firefox 5 and installed it in
Debian 6 because the same problem occured with Iceweasel.

First of all, and after some struggling, I suceeded in having Debian
recognizing the ACR38 card reader; no problems there. Following the procedure in Firefox, I open "Preferences / Advanced / Encryption /
Security Devices" and click on "Load". There I fill out the necessary
information and finally I get this message "Unable to add module"...
Can someone tell me why, and how to solve this issue? I guess Firefox and Iceweasel, have trouble detecting the card reader.

Thanks on forehand,
Paul