Firefox Quantum. How to save proxy password and login?

Question

proxy

How to save password and login from proxy in Firefox Quantum? When you open a browser, it asks you to enter a login and password for the proxy.
I tried all the tips from the first 3 pages of Google, no result.
Perhaps someone came across?

Answer 1

Here is a recipe for you on how to return the checkmark to remember proxy passwords.
1. Open about:config
2. Find the line network.negotiate-auth.allow-proxies
3. Double click on it to make the value false