OK and cancel both unclear do nothing for snap refresh notification

With notify-osd, the snap refreshment is done via a dialogue window notification, which says

> Update available for firefox.
>
> Close the application to update now. It will update automatically in 13 days.

and has OK and cancel buttons.

Why is either button mapped in this dialogue if no action is associated with either? Or at least it is not clear from the message what either button would do.

I experienced the same, just with a different message, after Firefox were refreshed. I don't remember the exact wording but it was something like

> Firefox has been updated.
>
> It is now ready to launch.

I clicked OK button expecting it to launch Firefox but it did not.