Can't add new citations in Word - bad Firefox update?

When I try to insert a reference in MS Word 2010 by clicking the citation button on the Add-Ins tab, I see the error message: "C:\Program Files (x86)\Mozilla Firefox\firefox.exe
This item no longer exists in your Zotero database. Do you want to select a substitute item?

Clicking 'No' will delete the field codes for citations containing this item, preserving the citation text but deleting it from your bibliography.

Yes No Cancel"

It doesn't seem to matter which option I select.

When I ask Zotero for help, it gives me the error code 816331315 and says it won't be reported (or something) if I don't post that number here.

Is this a Firefox update problem? I seem to vaguely remember just installing a Firefox update.

Any help would be much appreciated!!

This is an old discussion that has not been active in a long time. Instead of commenting here, you should start a new discussion. If you think the content of this discussion is still relevant, you can link to it from your new discussion.