Customization - manually resize or adjust the width of the 'Flexible Space' item on the toolbar

[AETH]

Hello! I would like to suggest a quality-of-life improvement for Firefox customization. It would be great to have the ability to manually resize or adjust the width of the 'Flexible Space' item on the toolbar. Right now, it takes up too much space by default, and the only way to shrink it is by crowding the toolbar with other items. Allowing users to resize it (e.g., via a slider or dragging) would give much better control over the layout.

[Jon]

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