diff --git a/app/config.sh b/app/config.sh
index 3deb636f37..d77b61af79 100644
--- a/app/config.sh
+++ b/app/config.sh
@@ -8,7 +8,7 @@ RUST_VERSION=1.94.0
 
 # URL prefix for custom builds of Firefox components
 custom_components_url="https://download.zotero.org/dev/firefox-components/"
-custom_components_hash_mac=""
+custom_components_hash_mac="6b586ed383a480fed9d9786ad18a6e6d90b140739e5e4491096df291ec887571"
 custom_components_hash_win_x64="db7c9556bd0f9e36120069391ce66cc199ed1ec4e2fdd3b931f71e35b4586d2b"
 custom_components_hash_win_arm64="fd0f44b38a471009ce1cdd926f7f48be43ed773dad350c62383b8a7235da8711"
 custom_components_hash_win32="694944349fdfd91296f272a68ac5d03183f02d47fdaa7ba9f2b1c74747652aa2"
diff --git a/app/mac/mozconfig b/app/mac/mozconfig
index 9d22089430..30cf8708dc 100644
--- a/app/mac/mozconfig
+++ b/app/mac/mozconfig
@@ -4,7 +4,7 @@ elif [ "$Z_ARCH" == "aarch64" ]; then
         ac_add_options --target=aarch64-apple-darwin
 fi
 ac_add_options --enable-bootstrap
-ac_add_options --with-macos-sdk=$HOME/tmp/MacOSX15.5.sdk
+ac_add_options --with-macos-sdk=$HOME/src/MacOSX26.5.sdk
 
 mk_add_options AUTOCLOBBER=1
 
@@ -24,6 +24,11 @@ export MOZILLA_OFFICIAL=1
 export RELEASE_OR_BETA=1
 MOZ_REQUIRE_SIGNING=
 
+# Official builds require source info, which Mozilla only detects automatically from
+# Mercurial checkouts
+export MOZ_SOURCE_REPO=https://github.com/mozilla-firefox/firefox
+export MOZ_SOURCE_CHANGESET=$(git -C "$topsrcdir" rev-parse HEAD)
+
 ac_add_options --enable-official-branding
 
 # Build updater without MAR signature verification
diff --git a/app/mac/zotero.xz b/app/mac/zotero.xz
index 3ce40d56a3..aeea62828c 100755
Binary files a/app/mac/zotero.xz and b/app/mac/zotero.xz differ