OO plugin 3.1b1 doesn't work here with Firefox 4 beta 9

Hi I'm testing Zotero 2.1 Beta 4 using Firefox 4 beta9 and OO 3.2.1 with my Mac 10.6.6. Zotero and the OO plugin install ok. Zotero works perfectly. But when I try to add citation in a OO doc I have first a security warning and then a message saying something like "Firefox could not load the component required to communicate with your word processor".

Everything works with same configuration but Firefox 3.6.13. Any thoughts?
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