diff --git a/www-client/icecat/Manifest b/www-client/icecat/Manifest
index 6aaf12a..90d1ed0 100644
--- a/www-client/icecat/Manifest
+++ b/www-client/icecat/Manifest
@@ -1,4 +1,4 @@
-DIST firefox-78esr-patches-12.tar.xz 67840 BLAKE2B d85abdbb54a252852badac50866cf5b5009c050ec4aa80ae2454eef2719e80f3442f5a74ec58d3c36531539042830427cd85507b708c1d5b36ea44dd0cef60b7 SHA512 4445c0880fc234c3838394483ce986e4e222260a99427069ba9c55b56fcd49a485ec916ee6aa2629f922390e92bfcd78028e30cc2e62fad9bc080ae45b26ba2e
 DIST firefox-78esr-patches-14.tar.xz 82976 BLAKE2B 08cc3618c8069f4169b7647e7eb699153d558bb89f8a4f1ed74d5ccd339f77119cd8f253df011f0c2f255ad889b65e843171d7559f469788463ca7e9aa2e96aa SHA512 1611c6f9d2c7d586e7b53810c1cfdb2682f5d289b1b019b71694b1ab2d8bbdfe827a73cfaf59f7e4808c0b90409ca4fa57e27655d8cdf0c578ffdbad33659f26
-DIST icecat-78.10.0-gnu1.tar.bz2 513140961 BLAKE2B e008b4bebc6dbec78eecd18c14f37c155c5f883279120584c2a774e1e8fc4a6d1d24369ef1799224ec309fde6f4a8c276cf205eea5ecbfd061bea55a089e6e9b SHA512 682d194c1404b039d60c1916648d319bb428ce5fb3058a8e5989437de7a80d2184aefd69004e22e0a8e639f026df4f6d7445a2cce551d929323b6193cbedad94
+DIST firefox-78esr-patches-15.tar.xz 65604 BLAKE2B 86e421e555ffd5f7f201d0f1a1c446c649739c67cdf8dca536efa115e09d9c357ce1551b7270c77e8bfe7dd53e0f3e6386496283879cf5e0c59b3c864951ebb3 SHA512 b229e895f083a0404cda1da0d8ae937429d5975ac52ab20e8b15611d9c737381a1076ebfa8c8a127dacac0e12a2a905ffd579facde2d80c6facc911e5739e34b
 DIST icecat-78.11.0-gnu1.tar.bz2 514067936 BLAKE2B 88b0b76a1e08d3c6114d55e3613097e778eeae11d271c722552fd90da51b50c6abf621b11c6ba15702d737510dbd5a72397c1078722dcf149b165435fc349794 SHA512 8969c4c6726364cb96dc9735942e39b1532ef1d591202e098b0a3bd269f12168c7efdd813373fc11e0dada1c6db964794db21ac0f08add6a0cc82daf183e136e
+DIST icecat-78.12.0-gnu1.tar.bz2 514309065 BLAKE2B 6b875778692a41efa568d66d35ea6c98dcb93baee6189711ef6b7eff81588508f0ceb78ce7065b3532af8b6a1cd5af9a7e0b42591af5ce7543067ad6393bce27 SHA512 bb7cbe72ced79abc3cbbea35e8ff841a8e79991d17b21fbd0a4d16f7ef7158f923818f9af74a5792d6a36360f3a7b28a884373dbe2a6c32b8016a4a5e023b6bf
diff --git a/www-client/icecat/icecat-78.10.0.ebuild b/www-client/icecat/icecat-78.12.0.ebuild
similarity index 95%
rename from www-client/icecat/icecat-78.10.0.ebuild
rename to www-client/icecat/icecat-78.12.0.ebuild
index adda4ff..3841947 100644
--- a/www-client/icecat/icecat-78.10.0.ebuild
+++ b/www-client/icecat/icecat-78.12.0.ebuild
@@ -6,9 +6,9 @@
 EAPI="7"
 
 # Using Gentoos firefox patches as system libraries and lto are quite nice
-FIREFOX_PATCHSET="firefox-78esr-patches-12.tar.xz"
+FIREFOX_PATCHSET="firefox-78esr-patches-15.tar.xz"
 
-LLVM_MAX_SLOT=11
+LLVM_MAX_SLOT=12
 
 PYTHON_COMPAT=( python3_{7..9} )
 PYTHON_REQ_USE="ncurses,sqlite,ssl"
@@ -17,8 +17,8 @@ WANT_AUTOCONF="2.1"
 
 VIRTUALX_REQUIRED="pgo"
 
-inherit autotools check-reqs desktop flag-o-matic gnome2-utils llvm \
-	multiprocessing pax-utils python-any-r1 toolchain-funcs \
+inherit autotools check-reqs desktop flag-o-matic gnome2-utils linux-info \
+	llvm multiprocessing pax-utils python-any-r1 toolchain-funcs \
 	virtualx xdg
 
 PATCH_URIS=(
@@ -26,7 +26,7 @@ PATCH_URIS=(
 )
 
 SRC_URI="
-	!buildtarball? ( icecat-"${PV}"-gnu1.tar.bz2 )
+	!buildtarball? ( icecat-${PV}-gnu1.tar.bz2 )
 	${PATCH_URIS[@]}
 "
 
@@ -54,6 +54,14 @@ BDEPEND="${PYTHON_DEPS}
 	virtual/pkgconfig
 	>=virtual/rust-1.41.0
 	|| (
+		(
+			sys-devel/clang:12
+			sys-devel/llvm:12
+			clang? (
+				=sys-devel/lld-12*
+				pgo? ( =sys-libs/compiler-rt-sanitizers-12*[profile] )
+			)
+		)
 		(
 			sys-devel/clang:11
 			sys-devel/llvm:11
@@ -79,10 +87,10 @@ BDEPEND="${PYTHON_DEPS}
 	!system-av1? (
 		amd64? ( >=dev-lang/nasm-2.13 )
 		x86? ( >=dev-lang/nasm-2.13 )
-	)"
+	)
+	buildtarball? ( ~www-client/makeicecat-"${PV}"[buildtarball] )"
 
 CDEPEND="
-	buildtarball? ( ~www-client/makeicecat-"${PV}"[buildtarball] )
 	>=dev-libs/nss-3.53.1
 	>=dev-libs/nspr-4.25
 	dev-libs/atk
@@ -164,19 +172,19 @@ S="${WORKDIR}/${PN}-${PV%_*}"
 
 llvm_check_deps() {
 	if ! has_version -b "sys-devel/clang:${LLVM_SLOT}" ; then
-		ewarn "sys-devel/clang:${LLVM_SLOT} is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
+		einfo "sys-devel/clang:${LLVM_SLOT} is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
 		return 1
 	fi
 
 	if use clang ; then
 		if ! has_version -b "=sys-devel/lld-${LLVM_SLOT}*" ; then
-			ewarn "=sys-devel/lld-${LLVM_SLOT}* is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
+			einfo "=sys-devel/lld-${LLVM_SLOT}* is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
 			return 1
 		fi
 
 		if use pgo ; then
 			if ! has_version -b "=sys-libs/compiler-rt-sanitizers-${LLVM_SLOT}*" ; then
-				ewarn "=sys-libs/compiler-rt-sanitizers-${LLVM_SLOT}* is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
+				einfo "=sys-libs/compiler-rt-sanitizers-${LLVM_SLOT}* is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
 				return 1
 			fi
 		fi
@@ -457,6 +465,7 @@ pkg_setup() {
 		# Ensure we use C locale when building, bug #746215
 		export LC_ALL=C
 	fi
+	linux-info_pkg_setup
 }
 
 src_unpack() {
@@ -568,6 +577,9 @@ src_configure() {
 	# Initialize MOZCONFIG
 	mozconfig_add_options_ac '' --enable-application=browser
 
+	# Set Gentoo defaults
+	export MOZILLA_OFFICIAL=1
+
 	mozconfig_add_options_ac 'Gentoo default' \
 		--allow-addon-sideload \
 		--disable-cargo-incremental \
@@ -886,6 +898,12 @@ src_install() {
 	# Set installDistroAddons to true so that language packs work
 	cat >>"${GENTOO_PREFS}" <<-EOF || die "failed to set extensions.installDistroAddons pref"
 	pref("extensions.installDistroAddons",     true);
+	pref("extensions.langpacks.signatures.required",	false);
+	EOF
+
+	# Disable signatures for language packs so that unsigned just built language packs work
+	cat >>"${GENTOO_PREFS}" <<-EOF || die "failed to disable langpacks signatures"
+	pref("extensions.langpacks.signatures.required",	false);
 	EOF
 
 	# Force hwaccel prefs if USE=hwaccel is enabled
@@ -905,7 +923,7 @@ src_install() {
 	# Install language packs
 	local langpacks=( $(find "${BUILD_DIR}"/dist/linux-x86_64/xpi -type f -name '*.xpi') )
 	if [[ -n "${langpacks}" ]] ; then
-		moz_install_xpi "${MOZILLA_FIVE_HOME}/distribution/extensions" "${langpacks[@]}"
+		moz_install_xpi "${MOZILLA_FIVE_HOME}/browser/extensions" "${langpacks[@]}"
 	fi
 
 	# Install geckodriver
@@ -1038,6 +1056,12 @@ pkg_preinst() {
 pkg_postinst() {
 	xdg_pkg_postinst
 
+	elog "Cloudflare browser checks are broken with GNU IceCats anti fingerprinting measures."
+	elog "You can fix cloudflare browser checks by undoing them in about:config like below:"
+	elog "   general.appversion.override: 78.0 (X11)"
+	elog "   general.oscpu.override: Linux x86_64"
+	elog "   general.platform.override: Linux x86_64"
+
 	if use pulseaudio && has_version ">=media-sound/apulse-0.1.12-r4" ; then
 		elog "Apulse was detected at merge time on this system and so it will always be"
 		elog "used for sound.  If you wish to use pulseaudio instead please unmerge"