Zotero 2.18 will not start with Firefox 6 on Mac

I upgraded to FF 6 when it came out, and have been using Zotero during the past week.

Tonight Zotero was suddenly missing from the add-on bar, and when I started Zotero from the Tools menu of Firefox, I got a totally blank pane.

I uninstalled and reinstalled Zotero from Firefox. Now Zotero does not show up in the Firefox Tools menu or in the add-on bar. It does show up in the FF Add-ons Manager, and I can bring up Zotero Preferences from there.

Help?

Zotero 2.18, Firefox 6.0, Mac OS 10.6.8.
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