Footnote popup location on Firefox

Chrome is fine

<img width="406" height="257" alt="Image" src="https://github.com/user-attachments/assets/0f832c93-2a55-4633-8366-7b241e8cd54a" />

Firefox has the popup appear on top of the footnote

<img width="404" height="245" alt="Image" src="https://github.com/user-attachments/assets/f68dbe72-4f17-40e7-be5a-7a0282a1c8bf" />