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Firefox Desktop - Vertical Tabs - Unremovable Blank Space On Toolbar

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Paradox949
Paradox949
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Trying out Vertical Tabs, but when doing so an unremovable Flexible Space appears in the Toolbar. You can move it around, but not remove it (image #2 is trying to drag it into the Customise Toolbar icon list). This thing disappears when switching back to Horizontal Tabs.

Any clue why this is happening?

Trying out Vertical Tabs, but when doing so an unremovable Flexible Space appears in the Toolbar. You can move it around, but not remove it (image #2 is trying to drag it into the Customise Toolbar icon list). This thing disappears when switching back to Horizontal Tabs. Any clue why this is happening?
Attached screenshots

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