There are crash reports for Fenix 4.2.0b0: https://crash-stats.mozilla.org/search/?version=4.2.0b0&product=Fenix&date=%3E%3D2020-03-24T20%3A34%3A00.000Z&date=%3C2020-03-31T20%3A34%3A00.000Z&_facets=signature&_facets=version&_facets=build_id&_sort=-date&_columns=date&_columns=signature&_columns=product&_columns=version&_columns=build_id&_columns=platform#facet-build_id But nothing for 4.2.0 which released recently. This bug covers figuring out why.
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There are crash reports for Fenix 4.2.0b0: https://crash-stats.mozilla.org/search/?product=Fenix&version=4.2.0&date=%3E%3D2020-03-24T20%3A34%3A00.000Z&date=%3C2020-03-31T20%3A34%3A00.000Z&_facets=signature&_facets=version&_facets=build_id&page=1&_sort=-date&_columns=date&_columns=signature&_columns=product&_columns=version&_columns=build_id&_columns=platform#facet-build_id But nothing for 4.2.0 which released recently. This bug covers figuring out why.