here is a query that handles some of logic for the top engines: https://sql.telemetry.mozilla.org/queries/65652/source#166785
Bug 1602019 Comment 2 Edit History
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here is a query that handles some of logic for the top engines: https://sql.telemetry.mozilla.org/queries/65652/source#166785 But, in short: Google DuckDuckGo Bing Yandex