Add reset to default shortcut and visual indicators for pinch zoom
I accidentally triggered pinch zoom, I was unaware that epiphany had this functionality, and it took me a while to figure out what I had done to make the page zoom-in and how to undo it.
A CTRL + 0 shortcut could be a good addition, it is a common shortcut found in most web browsers to undo a zoom. This is one of the first things a user who is familiar with the zoom functionality of other browsers will attempt to undo this accidental zoom.
Adding some kind of visual indicator to inform the user that the page is currently zoomed in or that the user is using the pinch zoom functionality should also help to avoid confusion.