Zotero 2.1 beta 5 poses a problem...?

I've just upgraded to Zotero 2.1 Beta 5, and I receive the message.

"Firefox could not load the component required to communicate with your word processor. Please ensure that the appropriate Firefox extension is installed and try again."

Can someone tell me what to do next? I thought that Zotero 2.1 Beta 5 was the extension. At least that is the impression given in the documentation. Does the word "extension" (mentioned above) now mean the word-processor plugin? But, as I make it out, there are no new word-processor plugins. Thanks in advance.
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