As you know, the problem with removing results navigation through TAB is that it's supported by other browsers (Chrome and now Edge Beta), it may not be trivial to change it, because even if Firefox usage of that feature is really low according to telemetry, we may not want to break incoming users expectations. I'm not sure what to suggest here, maybe we should just havea way to remove openViewOnFocus if a screen reader is in use.
Bug 1608766 Comment 2 Edit History
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As you know, the problem with removing results navigation through TAB is that it's supported by other browsers (Chrome and now Edge Beta), it may not be trivial to change it, because even if Firefox usage of that feature is really low according to telemetry, we may not want to break incoming users expectations. I'm not sure what to suggest here, maybe we should just disable openViewOnFocus behavior if a screen reader is in use.