diff --git a/tools/tinderbox/post-mozilla-rel.pl b/tools/tinderbox/post-mozilla-rel.pl
index 920fdb3cd413..196d34087669 100755
--- a/tools/tinderbox/post-mozilla-rel.pl
+++ b/tools/tinderbox/post-mozilla-rel.pl
@@ -724,6 +724,12 @@ sub packit_l10n {
   TinderUtils::print_log("Starting l10n builds\n");
 
   foreach my $wgeturl (keys(%Settings::WGetFiles)) {
+    if (defined($Settings::LocalizationVersionFile)) {
+      my $l10nVersion = read_file("$Settings::TopsrcdirFull/$Settings::LocalizationVersionFile");
+      chomp($l10nVersion);
+      $wgeturl =~ s/%version%/$l10nVersion/g;
+    }
+
     my $status = TinderUtils::run_shell_command_with_timeout("wget -nv --output-document \"$Settings::WGetFiles{$wgeturl}\" $wgeturl",
                                                              $Settings::WGetTimeout);
     if ($status->{exit_value} != 0) {
diff --git a/tools/tinderbox/tinder-defaults.pl b/tools/tinderbox/tinder-defaults.pl
index b0d70ca237c9..520603beccfa 100644
--- a/tools/tinderbox/tinder-defaults.pl
+++ b/tools/tinderbox/tinder-defaults.pl
@@ -43,6 +43,10 @@ $WGetTimeout       = 360; # Wget timeout, in seconds
 $BuildLocalesArgs  = "";  # Extra attributes to add to the makefile command
                           # which builds the "installers-<locale>" target.
                           # Typically used to set ZIP_IN and WIN32_INSTALLER_IN
+# If defined, the version file used in the local l10n build tree to construct
+# a URL to download for l10n repackaging (makes it so %WGetFiles doesn't need
+# to be modified every release).
+# $LocalizationVersionFile = "browser/config/version.txt";
 
 # Tests
 $CleanProfile             = 0;