The time has come...

im/config/mozconfigs/linux/mozconfig

@@ -15,3 +15,7 @@ ac_add_options --disable-debug
 ac_add_options --disable-tests
 ac_add_options --disable-dbus
 ac_add_options --disable-necko-wifi
+
+if [ `date +%m%d` = 1031 -o `date +%m%d` = 1101 ]; then
+ac_add_options --with-branding=instantbird/branding/halloween
+fi

im/config/mozconfigs/macosx/mozconfig

@@ -20,3 +20,7 @@ ac_add_options --enable-update-packaging
 ac_add_options --enable-optimize
 ac_add_options --disable-debug
 ac_add_options --disable-tests
+
+if [ `date +%m%d` = 1031 -o `date +%m%d` = 1101 ]; then
+ac_add_options --with-branding=instantbird/branding/halloween
+fi

im/config/mozconfigs/win32/mozconfig

@@ -19,3 +19,7 @@ ac_add_options --disable-tests
 ac_add_options --enable-update-packaging
 ac_add_options --enable-jemalloc
 ac_add_options --with-windows-version=600
+
+if [ `date +%m%d` = 1031 -o `date +%m%d` = 1101 ]; then
+ac_add_options --with-branding=instantbird/branding/halloween
+fi