[Zotero 5 beta] Zetero icon sometimes doesn't appear...

When I start FireFox(47.0.1 Korean), from time to time Zotero icon doesn't appear on the panel. So I can't start Zotero. I have to restart FF some times until Z icon appear. Whey did this happen?

I never has had this phenomenon with FF + Zotero 4.x.
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