KC Old browser system plugin give warning for using out-dated browser will be informed by a little, undisturbing bar, that his browser is not up-to-date and it is recommended to update
The user will be notified only once, and won't be bothered any more. The notification bar is very small and won't affect the browsing experience negatively.
user can adjust the time of the notification or if he want to keep alive forever he can do.
user can also adjust there color of bar and background.
user can set there version of browsers