sousa-gecko/browser/components/customizableui/docs/overflowable-toolbar.md

OverflowableToolbar

The OverflowableToolbar class is used for toolbars that, upon shrinking in width, can overflow their contents into an "overflow panel". In practice, this is really only the browser navigation toolbar - though in times past, it was possible to create multiple overflowable toolbars.

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