More verbose logging of harmless-but-scary-looking exception. b=408697 r=kai a=damon

security/manager/pki/resources/content/exceptionDialog.js

@@ -154,7 +154,9 @@ function checkCert() {
     // We *expect* exceptions if there are problems with the certificate
     // presented by the site.  Log it, just in case, but we can proceed here,
     // with appropriate sanity checks
-    Components.utils.reportError(e);
+    Components.utils.reportError("Attempted to connect to a site with a bad certificate in the add exception dialog. " +
+                                 "This results in a (mostly harmless) exception being thrown. " +
+                                 "Logged for information purposes only: " + e);
   } finally {
     gChecking = false;
   }