If you click a link on preview under HTTPs you are given the impression you cannot go back to your changes safely (in Firefox)

Steps to reproduce (Under HTTPs in Firefox):

1) Go to page with links on its content
2) Edit with CKEditor. Add some changes.
3) Click Preview
4) Click a link
5) Click the back button
6) You get:
This document is no longer available.
The requested document is not available in Firefox's cache.
As a security precaution, Firefox does not automatically re-request sensitive documents.
Click Try Again to re-request the document from the website

Users fear clicking the Try Again and report this as "Preview lost my my changes"