Plug in error message -- New Mozilla, 2011 Word for Mac

I've used Zotero on other computers but cannot get plug in to work on this iMac. I am using 2011 Word for Mac and using the most recent Mozilla (4.0.1). The error message says it will not work with this version of Mozilla.

Could I use Safari as the web browser instead? Do you know any work arounds?

Please advise. Thanks.
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