"An updated user interface is available"

Hi all,
I keep on getting a message pop up when logged in to my WT when using Mozilla Firefox iOS app.
Message is- “An updated user interface is available”
Screenshot attached.
Does anyone know what this is about?

Hi @mark_lennan,

This message is displayed when a Service Worker detects a new version of the WebThings Gateway user interface to cache. It should disappear when you reload the page and have the latest version cached.

If it doesn’t disappear, is anyone else experiencing this problem? I don’t know how to clear a service worker cache on iOS, but that might help.

Hi Ben,
Thanks for the reply.
Its not a problem at all as it goes away when hitting the close or reload buttons and it doesn’t pop up every time.
I was just curious as to what it was that’s all.