Not the password managers in the browser, but something to actually lock the entire browser so it can't be opened without a password.
Are you trying to implement like a Kiosk mode-? Is this for a tablet?
Read this about Firefox ....... How do I lock my Firefox browser?
Steps To Lock Mozilla Firefox With A Password
- Open Mozilla Firefox, click on Tools -> Add-ons.
- An Add-ons window will appear with a search box. ...
- At the top of all, you will see Master Password+ add-on. ...
- After installing, it will ask you to restart the browser.
- After restarting, you will see a lock icon in the address bar.
Nov 24, 2018
How To Lock Mozilla Firefox And Chrome With A password ...
https://www.techuntold.com › how-to-lock-mozilla-firefox-with-a-password
I guess I'm not understanding what you want to do.
You want to use a browser only for yourself and no one else can use it?
You can only do this with a password that is locked with a specific password. If you sync PCs, phones, ect... this may not work.
Quote