I loaded a file that I knew didn't exist to Mozilla and edited the error message to make some real content for the page. I will see if the page actually gets saved.
As Proof I will actually leave the server info that appears as the end of the message. Next I will try to add some style info to the HTML and see if I can bootstrap into an edited webpage from just the browser. I just noticed that the display of what I am typing, which is rendered in the browser did not check to see if tags were properly balanced.
The answers is that I did get the page saved and I was also able to apply a style sheet to the result. This means that Mozilla filefox is an adequate WYSIYG HTML editor. Mozilla uses separate editing steps for style and page body. It doesn't show the HTML header, and clearly states that you are editing a HTML body.
Or I am just OLD! The dampness cuts through to the bone. In the wee hours I woke up with chills even though I was under the blankets, and I am cold now at midday. The problem is the dampness, not just the air temperature.