diff --git a/.hgtags b/.hgtags
index da45d7df58e4..2e58623ecf38 100644
--- a/.hgtags
+++ b/.hgtags
@@ -89,3 +89,4 @@ b6627f28b7ec17e1b46a594df0f780d3a40847e4 FIREFOX_AURORA_13_BASE
 fd72dbbd692012224145be1bf13df1d7675fd277 FIREFOX_AURORA_17_BASE
 2704e441363fe2a48e992dfac694482dfd82664a FIREFOX_AURORA_18_BASE
 cf8750abee06cde395c659f8ecd8ae019d7512e3 FIREFOX_AURORA_19_BASE
+5bb309998e7050c9ee80b0147de1e473f008e221 FIREFOX_AURORA_20_BASE