Automatic syncing when closing Firefox
I guess Zotero doesn´t sync quite frequently neither when closing Firefox. Maybe syncing on close should be implemented on next releases?
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Consider that you need to reboot your computer: In this case waiting minutes for firefox to quite would not be considered a feature, but a bug by most users.
If you have chosen "sync automatically", Zotero synchronized very frequently. (If it does not, then there is a problem wit automatic sync that needs to be addressed)