MSAA problem

Hi,
I don't know if it the right place to ask this question but here it is:
I am encountering a problem using MSAA with firefox. When I set up an hook to get accesibility events (SetWinEventHook) it is working fine only if I set the hook after firefox is already launched. If I set it up before firefox is launched it is not working well. I think the reason is the fact that the oleacc.dll is loaded (to firefox) only after a long period of time. After it is loaded I start to recieve the events.
I see that there is a related bug in the bugzilla but as I understand it should be fixed: https://bugzilla.mozilla.org/show_bug.cgi?id=723797

Any idea ?
Any help will be appreciated.

Thanks,
Momico