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Ok, I enclose the screenshot.

Have you tried pressing <Esc> ?

When I am in the screen that looks like in the enclosed picture. Pressing <Esc> either in the address bar or in the main display area does not make the green EV Certificate message disappear or the URL in the address bar reappear. I still cannot see the URL.

(I am running Firefox 59.0 (64-bit) on Windows 7.)

Self defeating modifications the way you have done them, IMO.

So, you turn the monitor sideways, display the Search Bar (whoch is hidden by default), your have a few extra toolbar buttons on the Navigation Toolbar, and move the Bookmarks Toolbar Items to the Nav Bar - PLUS, I suspect that the 2 Flexible Spaces which are placed on each side of the URL Bar are still there which makes your 'problem' that much worse.

You set that problem up all by yourself! Rather than trying to deal with that EV certificate space, how about a less nonsensical approach to your customization of the UI?

1. Get rid of the two Flexible Spaces; if they are there as I suspect on either side of the URL Bar / Search Bar pairing.
2. Make use of the Overflow Menu which will drop down from the "Open menu" 3-bar button.
3. Use the Bookmarks Toolbar as its' own toolbar; you are gaining so much vertical space by turning monitor sideways why not use some of that vertical height to partially solve that 'problem'.
4. OR use some userChrome.css tricks to only display the Bookmarks Toolbar part of the time.

https://www.userchrome.org/ Example - here's some userChrome.css code to only have the Bookmarks Toolbar appear when the New Tab page is displayed, https://www.reddit.com/r/firefox/comments/7ghudm/autohide_bookmark_toolbar_on_active_tabs/ Here's one that shows the Bookmarks Toolbar only on cursor Hover. https://www.reddit.com/r/FirefoxCSS/comments/8lw7p6/show_bookmarks_bar_on_hover/

Here is a lot of userChrome.css ideas for Firefox Quantum. https://www.reddit.com/r/FirefoxCSS/

@the-edmeister: thanks for taking the time to respond. Your feedback is partially helpful. I do not accept your claims that I shouldn't be configuring my layout the way I did. The whole point of customization is that I should be able to customize the widgets the way that works for me, not the way it would work for you. My problem is that the EV Certificate with a company name may take too much room in the address bar. In fact it looks like it is the certificate owner that controls how much space will be consumed. In other cases, the messages are even longer (see the attachment). I am looking for ways to control this in the address bar. This problem has not been addressed.

You are correct that I am using redundant flexible space. Removing it helps a bit, Your advice about https://www.userchrome.org/ might prove helpful, if I combined with this advice: https://support.mozilla.org/en-US/questions/1061161 but now I am not sure if I will be able to tell the extended verification from the basic verification. I do want to see that the service has been verified, but I do not necessarily see the company name in the address bar. I think it is a legitimate expectation.

Ok, I managed to find the solution in this thread: https://support.mozilla.org/en-US/questions/1183981

I need to put the following in userChrome.css:

/* 
   Hide EVSSL Company Name in the identity area 
   unless hovered for half a second
*/
#identity-box.verifiedIdentity #identity-icon-labels {
  visibility: collapse !important;
  transition: visibility 250ms ease-in-out;
}
#identity-box.verifiedIdentity:hover #identity-icon-labels {
  visibility: visible !important;
  transition: visibility 250ms ease-in-out 500ms;
}

/* 
   Hide Extension Name in the identity area 
*/
#identity-box.extensionPage #identity-icon-labels {
  display: none !important;
}

That was very good work. Well done.