I see, I suspect that we cross the UrlbarEventBufferer.jsm 200ms timeout while waiting for the first result, we handle enter directly and just pass the @google something string to the docshell, that can't handle it. We should add directly handling of @tokens in the fallback code, and maybe increase the timer a bit.
Bug 1598616 Comment 4 Edit History
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I see, I suspect that we cross the UrlbarEventBufferer.jsm 200ms timeout while waiting for the first result, we handle enter directly and just pass the @google something string to the docshell, that can't handle it. We should add directly handling of @tokens in the fallback code (URIFIxup likely?), and maybe increase the timer a bit.