this is about the buttons that moved/placed the inspector window on the bottom, side or in a separate window
new ff has them stuffed in another three dots button
older ff (eg 60esr) had them on the inspector itself next to the close button
is there css or anything to move those 2 buttons (3 but one is in use so it wasn’t shown) out of the dots button as was before? if not I suggest you reverse this change and only apply it (put them inside the three dots button) if there’s no free space/width left