Unresponsive script error

I am running Firefox 3.5.6 and keep getting an "Unresponsive Script Error":

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.
Script: chrome://zotero/content/xpcom/zotero.js:1504

I have updated Zotero in Safe Mode as instructed. Does anyone know why I would get this error, and why it says "Chrome"?
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