Кнопки вариантов поиска для страницы поиска Google (1-2-3 дня, недели, PDF, ...)
< Обсуждения GoogleSearchExtraButtons
Check, please, this instruction https://greasyfork.org/en/scripts/7543-google-search-extra-buttons/discussions/141609 (Aug 22 2022) for installation in Opera GX. (Tampermonkey should not works as in Opera.)
Unfortunately, doesn't work with Opera GX.