diff --git a/configs/common/mozconfig b/configs/common/mozconfig
index c5def27bc..ce942bd32 100644
--- a/configs/common/mozconfig
+++ b/configs/common/mozconfig
@@ -78,6 +78,7 @@ if test "$ZEN_RELEASE"; then
 
   ac_add_options --enable-updater
 
+  export MOZ_PACKAGE_JSSHELL=1
 fi
 
 ac_add_options --enable-unverified-updates
diff --git a/configs/linux/mozconfig b/configs/linux/mozconfig
index 0193b58ea..dc8851f70 100644
--- a/configs/linux/mozconfig
+++ b/configs/linux/mozconfig
@@ -27,6 +27,8 @@ if test "$ZEN_RELEASE"; then
         mk_add_options 'export SCCACHE_GHA_ENABLED=on'
     fi
 
+    export MOZ_PGO=1
+    ac_add_options MOZ_PGO=1
 
     if test "$SURFER_COMPAT" = "true"; then
         ac_add_options --enable-optimize="-O3 -march=x86-64"