diff --git a/.hgtags b/.hgtags
index 33a559506279..a3ac6d30177e 100644
--- a/.hgtags
+++ b/.hgtags
@@ -5099,3 +5099,4 @@ f3783ad20bf40a11fb4b7ed088236c1a9f7be362 FIREFOX_128_7_0esr_BUILD1
 f3783ad20bf40a11fb4b7ed088236c1a9f7be362 FIREFOX_128_7_0esr_RELEASE
 c685d5844a0e4f99ac535b6ffc641fbd07696c68 FIREFOX_128_8_0esr_BUILD1
 c685d5844a0e4f99ac535b6ffc641fbd07696c68 FIREFOX_128_8_0esr_RELEASE
+76f59a9f2161a539a9b6b000fcb7205e8d007b11 FIREFOX_128_9_0esr_BUILD1