diff --git a/www-client/vivaldi/Manifest b/www-client/vivaldi/Manifest
index 042500d5b7770..c4e0ade8324bf 100644
--- a/www-client/vivaldi/Manifest
+++ b/www-client/vivaldi/Manifest
@@ -2,3 +2,5 @@ DIST vivaldi-stable_7.7.3851.56-1_amd64.deb 123784324 BLAKE2B ab205b9699325ba18a
 DIST vivaldi-stable_7.7.3851.56-1_arm64.deb 117227136 BLAKE2B f18d01bc36fa84c361831c533c0d3f56bafd65c9029eda83ce855ab58ce9905b7480d7cdc342b2747d6c1eacc11afad24b852cbcbb4a2e94ea7f5dae80aa94d4 SHA512 5c944db1c8cecf154ce5e40c0ce982edda02d406e79620b15e706c8dc018fd8d7b335a56b5da98dd9279b29b1506d21bcc512c374b142555e70d111cde27d702
 DIST vivaldi-stable_7.7.3851.58-1_amd64.deb 123809232 BLAKE2B 4d318d3d4caa0ca8dcae76e27791ae57d008b956180598e680df90a958223113cfb1470aa28205498ceb6c2a50e760c970a0d105129e60351003f4c9f0654b3a SHA512 ca9f9021ecbfbd11c5c5095fa67e0a45a392e2b5f5bd3207fcb88101bef7c9c35fde63f607af843518b9696141fa95bdfe45b15e942a9828805ccafc845cd50f
 DIST vivaldi-stable_7.7.3851.58-1_arm64.deb 117314284 BLAKE2B 6ada2e8f7e5442c80b72b7d1e1d23e60109992b28a66dce431aae492ac2cedaf7221eebaff3dcce2c36d5a03b446eb6d63ae9456611559ffac2dc145b23d7e12 SHA512 98461aa7582e55dfc598380b84c195381a53b16a106c7bfab539c3466e3b47c58abfb382bc6187745f7f8fc5db15da5400662cc80204d82e24d5e303e403f3c0
+DIST vivaldi-stable_7.7.3851.66-1_amd64.deb 123858452 BLAKE2B 878f39d9dff002d03eaf4c8a6eeb0315123a6a55720ae3cdfb35f142cd85cf423b379e0e8d4377a5c43b0a1b338728bf42187ea28ddcf3e32420178f6bc139a7 SHA512 a7b1e532b52108ad9e24b78f54d8bc38a5ce08eda8611010964354d4701ca910bfb5464a80c87478d06b8790df59c2b08d6e04bc1fc2ba2646464077ffb887fc
+DIST vivaldi-stable_7.7.3851.66-1_arm64.deb 117169972 BLAKE2B 18dff5987ae46dcfefc7c9cdbe7cb5c69ea28ebbcef1cfc40e06da2cc2f8a4e00cc83a2af5c90857b65579c320b826b85087dd6ef47af4d334a4b9c424130325 SHA512 5321529f52597546136aa986625bc20858a26581f591a19495d6f98773316b59687563abd017254e7b01831a68895e3befb3441516ce821c98ba5d759a2e52c1
diff --git a/www-client/vivaldi/vivaldi-7.7.3851.66.ebuild b/www-client/vivaldi/vivaldi-7.7.3851.66.ebuild
new file mode 100644
index 0000000000000..082e4fdd28b50
--- /dev/null
+++ b/www-client/vivaldi/vivaldi-7.7.3851.66.ebuild
@@ -0,0 +1,217 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+CHROMIUM_VERSION="142"
+CHROMIUM_LANGS="
+	af
+	am
+	ar
+	az
+	be
+	bg
+	bn
+	ca
+	ca-valencia
+	cs
+	da
+	de
+	de-CH
+	el
+	en-GB
+	en-US
+	eo
+	es
+	es-419
+	es-PE
+	et
+	eu
+	fa
+	fi
+	fil
+	fr
+	fy
+	gd
+	gl
+	gu
+	he
+	hi
+	hr
+	hu
+	hy
+	id
+	io
+	is
+	it
+	ja
+	jbo
+	ka
+	kab
+	kmr
+	kn
+	ko
+	lt
+	lv
+	mk
+	ml
+	mr
+	ms
+	nb
+	nl
+	nn
+	pa
+	pl
+	pt-BR
+	pt-PT
+	ro
+	ru
+	sc
+	sk
+	sl
+	sq
+	sr
+	sr-Latn
+	sv
+	sw
+	ta
+	te
+	th
+	tr
+	uk
+	ur
+	vi
+	zh-CN
+	zh-TW
+"
+
+inherit chromium-2 desktop linux-info toolchain-funcs unpacker xdg
+
+VIVALDI_PN="${PN/%vivaldi/vivaldi-stable}"
+VIVALDI_HOME="opt/${PN}"
+DESCRIPTION="A browser for our friends"
+HOMEPAGE="https://vivaldi.com/"
+
+if [[ ${PV} = *_p* ]]; then
+	DEB_REV="${PV#*_p}"
+else
+	DEB_REV=1
+fi
+
+VIVALDI_BASE_URI="https://downloads.vivaldi.com/${VIVALDI_PN#vivaldi-}/${VIVALDI_PN}_${PV%_p*}-${DEB_REV}_"
+
+SRC_URI="
+	amd64? ( ${VIVALDI_BASE_URI}amd64.deb )
+	arm64? ( ${VIVALDI_BASE_URI}arm64.deb )
+"
+
+S="${WORKDIR}"
+LICENSE="Vivaldi"
+SLOT="0"
+KEYWORDS="-* ~amd64 ~arm64"
+IUSE="ffmpeg-chromium gtk proprietary-codecs qt6 widevine"
+RESTRICT="bindist mirror"
+#REQUIRED_USE="ffmpeg-chromium? ( proprietary-codecs )"
+
+RDEPEND="
+	>=app-accessibility/at-spi2-core-2.46.0:2
+	dev-libs/expat
+	dev-libs/glib:2
+	dev-libs/nspr
+	dev-libs/nss
+	media-libs/alsa-lib
+	media-libs/mesa[gbm(+)]
+	net-print/cups
+	sys-apps/dbus
+	x11-libs/cairo
+	x11-libs/libdrm
+	x11-libs/libX11
+	x11-libs/libxcb
+	x11-libs/libXcomposite
+	x11-libs/libXdamage
+	x11-libs/libXext
+	x11-libs/libXfixes
+	x11-libs/libxkbcommon
+	x11-libs/libXrandr
+	x11-libs/pango
+	gtk? ( gui-libs/gtk:4 x11-libs/gtk+:3 )
+	proprietary-codecs? (
+		!ffmpeg-chromium? ( >=media-video/ffmpeg-6.1-r1:0/58.60.60[chromium] )
+		ffmpeg-chromium? ( media-video/ffmpeg-chromium:${CHROMIUM_VERSION} )
+	)
+	qt6? ( dev-qt/qtbase:6[gui,widgets] )
+	widevine? ( www-plugins/chrome-binary-plugins )
+"
+
+QA_PREBUILT="*"
+CONFIG_CHECK="~CPU_FREQ"
+
+src_unpack() {
+	unpack_deb ${A}
+}
+
+src_prepare() {
+	# Rename docs directory to our needs.
+	mv usr/share/doc/{${VIVALDI_PN},${PF}}/ || die
+
+	# Decompress the docs.
+	gunzip usr/share/doc/${PF}/changelog.gz || die
+
+	# The appdata directory is deprecated.
+	mv usr/share/{appdata,metainfo}/ || die
+
+	# Remove cron job for updating from Debian repos.
+	rm etc/cron.daily/${PN} ${VIVALDI_HOME}/cron/${PN} || die
+	rmdir etc/{cron.daily/,} ${VIVALDI_HOME}/cron/ || die
+
+	# Remove scripts that will most likely break things.
+	rm -vf ${VIVALDI_HOME}/update-ffmpeg || die
+
+	pushd ${VIVALDI_HOME}/locales > /dev/null || die
+	rm ja-KS.pak ja-KS_*.pak || die # No flag for Kansai as not in IETF list.
+	chromium_remove_language_paks
+	popd > /dev/null || die
+
+	if use proprietary-codecs; then
+		einfo Bundled $($(tc-getSTRINGS) ${VIVALDI_HOME}/lib/libffmpeg.so | grep -m1 "^FFmpeg version ")
+		rm ${VIVALDI_HOME}/lib/libffmpeg.so || die
+		rmdir ${VIVALDI_HOME}/lib || die
+	fi
+
+	# Qt5 is obsolete now.
+	rm ${VIVALDI_HOME}/libqt5_shim.so || die
+
+	if ! use qt6; then
+		rm ${VIVALDI_HOME}/libqt6_shim.so || die
+	fi
+
+	eapply_user
+}
+
+src_install() {
+	mv */ "${D}" || die
+	dosym ../../${VIVALDI_HOME}/${PN} /usr/bin/${VIVALDI_PN}
+	fperms 4711 /${VIVALDI_HOME}/vivaldi-sandbox
+
+	local logo size
+	for logo in "${ED}"/${VIVALDI_HOME}/product_logo_*.png; do
+		size=${logo##*_}
+		size=${size%.*}
+		newicon -s "${size}" "${logo}" ${PN}.png
+	done
+
+	if use proprietary-codecs; then
+		dosym ../../usr/$(get_libdir)/chromium/libffmpeg.so$(usex ffmpeg-chromium .${CHROMIUM_VERSION} "") \
+			  /${VIVALDI_HOME}/libffmpeg.so.$(ver_cut 1-2)
+	fi
+
+	if use widevine; then
+		dosym ../../usr/$(get_libdir)/chromium-browser/WidevineCdm \
+			  /${VIVALDI_HOME}/WidevineCdm
+	fi
+
+	case ${PN} in
+		vivaldi) dosym ${VIVALDI_PN} /usr/bin/${PN} ;;
+		vivaldi-snapshot) dosym ${PN} /${VIVALDI_HOME}/vivaldi ;;
+	esac
+}