Pinned tab of Zotoro vanishes after Firefox restart

Hi,

I used to always have Zotero open in a pinned tab. But some time ago (con't remember the exact FF version) the pinned tab simply vanished after a FF restart. So I have to first make Zotero appear at the bottom and then click to tab and then pin that tab again. A bit cumbersome really.
Is this a known problem?
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