Firefox Add-on not showing collections on macbook

A professor I'm helping has both an iMac and Macbook and uses Zotero FF add-on for both. When he views his zotero library on the Macbook, he can't see his collections (there's no arrow for his to click on to view them). He is usingFF 50.1.0 and Zotero FF plugin When he views it on FF on his iMac, everything is fine.
Any ideas why this might be happening on the macbook only? Thanks.
  • But the items in the library are there? He has tried restarting? Is the left-hand panel maybe just collapsed?
  • The items in the library were showing,just not the collections folders. He rebooted and now it's showing. Why didn't I think of that? Thanks Adam.
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