Problems with syncing zotero online library with zotero browser

To make a long story short I had problems updating to the new version of zotero and needed to uninstall firefox, reinstall firefox and download zotero 2.0.9. So now I am trying to get my online (250 mb) zotero library synced with my empty zotero library and waiting hours with the green arrow spinning out continuously. What to do?

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