Zotero 1.0.9 stopped working after Firefox 3.0.6 update

I have been using Zotero 1.0.9 in Firefox 3 for some time with no problems. After installing the latest Firefox update today (3.0.6), the Zotero button no longer appears in the corner of my Firefox window. Zotero is still listed under Tools --> Add-ons --> Extensions, but pushing the 'Options' button there causes Firefox to crash. I tried uninstalling and reinstalling Zotero, but I still have the same symptoms.

Has anyone else encountered this problem?

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