Note that the URL bar's moz-input-box is also used to set role="combobox" and aria-owns on an ancestor of the input, which is required for a11y. We can just use an arbitrary container for this (div, span, whatever), but I thought it worth mentioning that this is definitely still needed, as I'm not sure we have a test for this at present.
Bug 1586591 Comment 2 Edit History
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Note that the URL bar's moz-input-box is also used to set role="combobox" and aria-owns on an ancestor of the input, which is required for a11y. We can just use an arbitrary container for this (div, span, whatever), but I thought it worth mentioning that these ARIA attributes on an ancestor are definitely still needed, as I'm not sure we have a test for this at present.