diff --git a/.hgtags b/.hgtags
index a61a090f..667525de 100644
--- a/.hgtags
+++ b/.hgtags
@@ -832,3 +832,4 @@ f26b0564bdcef44eda4c7935425b52bae4070744 THUNDERBIRD_16_0b3_BUILD1
 595d613b87b2b5b930c8992f88f4586c3bd8848f THUNDERBIRD_16_0_BUILD1
 595d613b87b2b5b930c8992f88f4586c3bd8848f FIREFOX_10_0_8esr_RELEASE
 595d613b87b2b5b930c8992f88f4586c3bd8848f FIREFOX_10_0_8esr_BUILD1
+c64eb9e071577ba591b6f01b139d1a2ba430da70 FIREFOX_16_0_RELEASE