diff --git a/make.conf/00common b/make.conf/00common
index b7a6cfe..6336a49 100644
--- a/make.conf/00common
+++ b/make.conf/00common
@@ -32,7 +32,7 @@ LDFLAGS="${LDFLAGS} -rtlib=compiler-rt -unwindlib=libunwind"
 # don't strip comment section of binaries
 PORTAGE_STRIP_FLAGS="--strip-unneeded -N __gentoo_check_ldflags__ -R .GCC.command.line -R .note.gnu.gold-version"
 
-USE="clang dist-kernel llvm-libunwind lto pulseaudio X -systemd -wayland"
+USE="clang dist-kernel llvm-libunwind lto pulseaudio X zstd -systemd -wayland"
 
 PYTHON_TARGETS="python3_11 python3_12"
 PYTHON_SINGLE_TARGET="python3_11"
diff --git a/package.accept_keywords/firefox b/package.accept_keywords/firefox
index 906618d..f6d9849 100644
--- a/package.accept_keywords/firefox
+++ b/package.accept_keywords/firefox
@@ -1,3 +1,3 @@
 www-client/firefox:rapid ~amd64
 
-# dev-libs/nss ~amd64
+=dev-libs/nss-3.92 ~amd64
diff --git a/package.env/sys b/package.env/sys
index 7f2dd28..41783e7 100644
--- a/package.env/sys
+++ b/package.env/sys
@@ -1,4 +1,7 @@
-sys-kernel/* clang lld no-lto
+sys-kernel/gentoo-kernel clang lld no-lto
+sys-kernel/* gcc mold no-lto
 
 sys-libs/efivar gcc mold no-lto
 sys-libs/glibc gcc mold no-lto
+
+app-arch/unzip no-lto