Options in pop-up menu are cut off when inside overflow menu

[Elaborendum]

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How it looks in the overflow menu: How it looks normally:

The pop-up is smaller when inside the thinner overflow menu, leading to some options getting cut off (in this case, Right tab, left tab and Always)

[rNeomy]

I have no idea how to fix this! I don't understand why Firefox limits the popup size in the overflow menu. No other browser does this.

We need a CSS media query to detect openings in the overflow menu.