Hi,

(assuming you're using the html client library version 4.4.1 build 1396.4, that is the one that came with server 3.6 build 1463.2)
I didn't test such version of the web client against firefox 9 but I confirm that the latest version of the library works correctly on the new Firefox.

I suggest to try to run one of the demo that came with the server you downloaded to verify that the issue is with our library and not with your application.
If that's the case you should upgrade to solve the issue.

HTH.