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Firefox Menu Disappears after using Hot Corners on macOS

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The Firefox menu (at the top above the browser window: File, Edit, View, etc.) disappears when I use a Hot Corner on macOS to Mission Control. See attached screenshot, I blacked out (with green) the open tabs.

If I go to Mission Control again, the FF menu then reappears.

FF is the only application to which this happens. And it seems to have started one or two FF updates ago. (Within the past 2/3 weeks).

macOS 15.3.2 FF 136.0.4 (aarch64).

Any thoughts as to how/ why this is happening and how to prevent it? It is not affecting performance but is a little annoying. This happens on a MacBook Pro M3, MacBook Air M4, and a MacStudio M1.

Thanks for your time and help!

The Firefox menu (at the top above the browser window: File, Edit, View, etc.) disappears when I use a Hot Corner on macOS to Mission Control. See attached screenshot, I blacked out (with green) the open tabs. If I go to Mission Control again, the FF menu then reappears. FF is the only application to which this happens. And it seems to have started one or two FF updates ago. (Within the past 2/3 weeks). macOS 15.3.2 FF 136.0.4 (aarch64). Any thoughts as to how/ why this is happening and how to prevent it? It is not affecting performance but is a little annoying. This happens on a MacBook Pro M3, MacBook Air M4, and a MacStudio M1. Thanks for your time and help!
Attached screenshots

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