diff --git a/.hgtags b/.hgtags
index 7d87a3e6a36e8f93c912dd2c5526c0394299f742..aa7f61810795db804c9c53922c158bcdf29d4a21 100644
--- a/.hgtags
+++ b/.hgtags
@@ -4397,3 +4397,4 @@ aa9f02961b2bbb92e17fea5d6b8fd14c097baf72 FIREFOX_115_6_0esr_RELEASE
 980ec32f825b2f54c05d16057a6e60d5b62d2ee2 FIREFOX_115_7_0esr_RELEASE
 17fcbdf6426663c10da5d0ba21927e71184304c3 FIREFOX_115_8_0esr_BUILD1
 17fcbdf6426663c10da5d0ba21927e71184304c3 FIREFOX_115_8_0esr_RELEASE
+f3dd0afed51cb7283d4fa06a0c40286eee657e30 FIREFOX_115_9_0esr_BUILD1