--- a/MozillaFirefox/MozillaFirefox.spec	Mon Nov 25 08:30:26 2019 +0100
+++ b/MozillaFirefox/MozillaFirefox.spec	Mon Nov 25 08:41:45 2019 +0100
@@ -476,8 +476,8 @@
 %install
 cd $RPM_BUILD_DIR/obj
 source %{SOURCE4}
-export MOZ_SOURCE_STAMP=$REV
-export MOZ_SOURCE_REPO=$REPO
+export MOZ_SOURCE_STAMP=$RELEASE_TAG
+export MOZ_SOURCE_REPO=$RELEASE_REPO
 # need to remove default en-US firefox-l10n.js before it gets
 # populated into browser's omni.ja; it only contains general.useragent.locale
 # which should be loaded from each language pack (set in firefox.js)