syncing makes firefox not respond

Error code 998649662
This is a reopening of the problem at 864305337, dealt with by Dan Stillman.

Having refreshed firefox, I can't get Zotero to work. When I open it and try to use it it makes firefox hang, whereas firefox works fine when Zotero is not open. The sync arrow is either turning or stuck with a symbol of how far it has got.
thanks,
Sophie
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