You should do that through Group Policy, rather than on any individual client configuration.

A group policy overrides settings on an individual client and the standard users can't change it, not having proper privileges for them to do so.

Please provide some details for group policy which can be used to disable this option

What specific settings would you want to block?

I want to grayed out block dangerous and deceptive content in security section

Do you need to do it on a server or it's on your home PC only?

Home pc . But I don't want this can be changed in UI.

Why would want this? Are you writing some malware??

Excuse me, but if you're doing this on your home PC, I don't understand why bother.

I do believe it's a question you should ask developers, because it would imply creating personalized APIs.

I'm not exactly a developer here.

What prefs did you lock?

See also:

• https://dxr.mozilla.org/mozilla-release/source/browser/components/preferences/in-content/security.xul

We are deploying firefox in our enviornment for 500 PC and we don't want that you can uncheck this setting.