diff --git a/extra/firefox/sources b/extra/firefox/sources
index 261bcf83..0dcfef14 100644
--- a/extra/firefox/sources
+++ b/extra/firefox/sources
@@ -1,4 +1,4 @@
-https://ftp.mozilla.org/pub/firefox/releases/90.0/source/firefox-90.0.source.tar.xz
+https://ftp.mozilla.org/pub/firefox/releases/VERSION/source/firefox-VERSION.source.tar.xz
 https://ftp.gnu.org/gnu/autoconf/autoconf-2.13.tar.gz autoconf2.13/
 https://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz yasm/
 patches/no-x11.patch