HELP I can't find norton in google chrome extensions

I know there been subjects on about this but i still can't solve this problem which is really frustrating because i wanna know that am safe and it's working. When i first got google chrome i had the norton in extension list but a few days ago i noticed that it wasn't there so I began to try doing things that i thought could fix this problem i tried reninstalling google chrome and updating norton but nothing worked i also kept on trying if there were shortcuts to find the norton on google chrome but there weren't any. So please could someone tell me how to get the norton back into the extension list.