diff --git a/.hgtags b/.hgtags
index cc0d348bd1e4..71ad736985f0 100644
--- a/.hgtags
+++ b/.hgtags
@@ -5091,3 +5091,4 @@ c4a5d008ee64fab523384408fa2868e2d028025d FIREFOX_128_4_0esr_RELEASE
 68352da82b95d7114af99b268c179195fd2fead0 FIREFOX_128_5_0esr_RELEASE
 a6cdcd2ed9ec3e256f358010672bafd1674b0b8b FIREFOX_128_5_1esr_BUILD1
 a6cdcd2ed9ec3e256f358010672bafd1674b0b8b FIREFOX_128_5_1esr_RELEASE
+f2cc51880bf4f49bfe087a2cc569388cab97242e FIREFOX_128_5_2esr_BUILD1