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How do I use flexible space when customizing the toolbar?

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I'm trying to customize my toolbar, but I can't get flexible space to work. I put it on the left of the toolbar, but I don't get any arrows that let me extend it at all. It acts like half the size of a normal empty space. How do I get it to work? Also, should the arrows be while I'm still in "customization mode" or when I click "done"? I'm using the latest version of Firefox.

I'm trying to customize my toolbar, but I can't get flexible space to work. I put it on the left of the toolbar, but I don't get any arrows that let me extend it at all. It acts like half the size of a normal empty space. How do I get it to work? Also, should the arrows be while I'm still in "customization mode" or when I click "done"? I'm using the latest version of Firefox.

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