diff --git a/mozilla/toolkit/locales/en-US/chrome/global/xpinstall/xpinstall.properties b/mozilla/toolkit/locales/en-US/chrome/global/xpinstall/xpinstall.properties
index a7904b5d0d7..c8743c92f9c 100644
--- a/mozilla/toolkit/locales/en-US/chrome/global/xpinstall/xpinstall.properties
+++ b/mozilla/toolkit/locales/en-US/chrome/global/xpinstall/xpinstall.properties
@@ -102,6 +102,7 @@ ERROR=ERROR
 error0=Success
 error999=Restart to complete
 error-202=Access denied
+error-203=Unexpected installation error\nReview the JavaScript Console log for more details.
 error-204=Install script not found
 error-207=Not a valid install package
 error-208=Invalid argument