Full screen mode of Zotero removes menubar
I do use Zotero on a regular base in full screen mode. If I do close Firefox without to reduce Zotero pane before quitting Firefox it will make the Firefox menubar invisible next time I do start Firefox and I've to delete the localstore.rdf to get it back.
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BionatsciI had this problem a while back. I think I worked out in the end that it was caused by some sort of incompatibility with another extension, but I can't remember which one ATM - if you could list the other firefox extensions you have installed that might jog my memory if this is the same problem. I don't think it was on the list of incompatible extensions.