Browser toolbox, info popup hidden behind ... popup

This one has been driving me crazy for ages...

When I use the Browser Toolbox - with the option Disable popup auto-hidebeing checked - and I hover over or select an element in the inspector , the info panels/tooltips that are usually displayed above and/or in front of the targeted/selected elements are covered by the open popups.

Also, the selected UI popup parts are not highlighted as they would be for other bits, there's only that dotted grid visible - again partially hidden - that gives you a general idea of what you are looking at.

This is on MacOs/Fx 115esr; I understand the issue is the same on Windows.

I've tried lots of css and javascript codes to find a way to target that thing, but to no avail.

The Fx popups in general have a silly high z-index, so that might be part of the issue; I'm wondering if there's any way to fix that.

Screenshot below.