Unfortunately, you can't test it right now due to https://bugzilla.wikimedia.org/71595 , but the edit page currently looks like:

https://i.imgur.com/h4GTzUB.png

(Thanks to Quiddity for the screenshot).

I think the main button bar is too busy.  Save page is fine; that color is semantically correct and it's the main action.

However, I suggest we consider making preview and/or show pages neutral (basically, that looks like a button, but is not colored in the current skin).