Erk. --enable-chrome-format actually defaults to jar not both.

configure

@@ -138,7 +138,7 @@ ac_help="$ac_help
   --disable-jar-packaging Disable jar packaging of chrome (Deprecated) "
 ac_help="$ac_help
   --enable-chrome-format=[jar|flat|both]
-                          Select format of chrome files (defaults to both)"
+                          Select format of chrome files (defaults to jar)"
 ac_help="$ac_help
   --disable-md            Do not use compiler-based dependencies "
 ac_help="$ac_help

configure.in

@@ -3437,7 +3437,7 @@ MOZ_ARG_DISABLE_BOOL(jar-packaging,
 
 MOZ_ARG_ENABLE_STRING(chrome-format,
 [  --enable-chrome-format=[jar|flat|both]
-                          Select format of chrome files (defaults to both)],
+                          Select format of chrome files (defaults to jar)],
     MOZ_CHROME_FILE_FORMAT=`echo $enableval | tr A-Z a-z`)
 
 if test -z "$MOZ_CHROME_FILE_FORMAT"; then