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Firefox opens M365 files in a browser tab instead of the desktop app

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In the SharePoint library Setting is the desktop App defined to open M365-files. Chrome, Edge and Opera, open the files in the desktop App. Not so Mozilla Firefox: with this browser, the files are opened in a Tab, instead of the desktop App. Why is that? How can I change this behaviour?

It did'nt change with marking "Ask, how files are opened or saved With kind regards, Christian

Reformierte Kirche Aargau [removed address and phone# from public forum]

In the SharePoint library Setting is the desktop App defined to open M365-files. Chrome, Edge and Opera, open the files in the desktop App. Not so Mozilla Firefox: with this browser, the files are opened in a Tab, instead of the desktop App. Why is that? How can I change this behaviour? It did'nt change with marking "Ask, how files are opened or saved With kind regards, Christian Reformierte Kirche Aargau [removed address and phone# from public forum]
Attached screenshots

Modified by James