zotero icon has disappeared

Hello,
I turned on my computer. The small Zotero icon in the bottom right of my screen was no longer visible. I searched (probably not really well) on the Zotero forum to find a solution. I have not found the solution (probably because I have some difficulties with my english comprehension). I wonder if the problem was not related to the fact that I accepted an update for firefox, just by starting the computer. Then I rebooted my computer again. Now, the icon appears in the bottom right, but above, there is a yellow triangle which says "warning, an error occurred while starting Zotero”. What can I do? Or what is the internet address of the solution, in the “support”?
Thank you for helping me.
Macchi

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