Hi Reg

This support article should help:

https://support.mozilla.org/en-US/kb/use-primary-password-protect-stored-logins

Paul,

 That article was helpful.  I wanted to follow-up, wonder if I can here or need a new thread?  
  Well I'll try.  
  --It is morning and I am going to view Internet articles first for a few minutes and then continue with opening email accounts.  At what stage would I enter my Mozilla password, before I started reading news or entertainment news, or later when I am ready to begin email accounts, messaging, etc.?  
 Thanks a lot for helping. 
Sincerely,
 Reg

The primary password would protect your email account and also the entertainment news if you had to sign into a service to view that.

Thanks Paul. To put a final touch on it, the day begins and I click on Firefox and on the top right is Sign In. I clicked there today and saw (see the attached screenshot) and go to Sign In and begin my rounds.

 Is that the right placed to sign in, or do I have it wrong?  
 Pls clarify for the amateur. 
 Reg

That is if you want to set up or sign into Firefox Sync.

The primary password will trigger when you try to sign into an account that you have saved the password for in Firefox.

Paul,

 After reading your post, feel I may be on the wrong track.
 I don't need to sync with Firefox, my intent with the Primary Pass was to set a barrier

to access, not to sync.

 Clicking on the Mozilla icon with the homepage opening, where do I go to enter the Primary

Pass? I won't save other passes on Firefox, only use the Primary Pass as a "front end barrier."

 If it sounds complicated, may be my inability to explain.  
  Q.  On the homepage, What tab do I open, or, Where do I click, and then wait a second, for the page to come to enter the Primary Pass?  
 Appreciate your patience.  May be good training for you to deal with simple amateurs.  
 Thanks.
 Reg

Hi Reg, first, please do not indent lines with spaces here on the forum, it is interpreted as a formatting command and makes posts hard to read.

Second, Firefox does not have a feature to lock access to the entire browser. If you set up a Primary Password to limit access to your saved logins, a person can cancel the password dialog and use all the OTHER features of the browser, just without access to your saved logins.

Firefox relies on your system security to prevent unauthorized access to your computer and its applications. For example, you can lock your screen when you leave your computer unattended. You might be familiar with this screen: https://support.microsoft.com/en-us/windows/customize-the-lock-screen-in-windows-81dab9b0-35cf-887c-84a0-6de8ef72bea0

If you haven't used it before, the keyboard shortcut to lock the screen and require your Windows password is Windows key + L.