--- a/.hgignore
+++ b/.hgignore
@@ -1,22 +1,24 @@
 # .hgignore - List of filenames hg should ignore
 
 # Filenames that should be ignored wherever they appear
 ~$
 \.pyc$
+(^|/)TAGS$
 
 # User files that may appear at the root
 ^\.mozconfig$
 ^mozconfig$
 ^\.mozconfig\.mk$
 ^\.mozconfig\.out$
 ^configure$
 ^config\.cache$
 ^config\.log$
+^ID$
 
 # Empty marker file that's generated when we check out NSS
 ^security/manager/\.nss\.checkout$
 
 # Build directories
 ^obj-
 ^objdir-