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Locking Preferences

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So I'm trying to lock the preferences on the privacy & security options. I currently have a .js file named autoconfig.js in my "C:\Program Files\Mozilla Firefox\defaults\pref" I also have mozilla.cfg in my "C:\Program Files\Mozilla Firefox".

When I go to the about:config however it is not greyed out or locked in anyway. I was wondering if anyone could spot what I'm doing wrong.

Yes my File name extensions is on.

So I'm trying to lock the preferences on the privacy & security options. I currently have a .js file named autoconfig.js in my "C:\Program Files\Mozilla Firefox\defaults\pref" I also have mozilla.cfg in my "C:\Program Files\Mozilla Firefox". When I go to the about:config however it is not greyed out or locked in anyway. I was wondering if anyone could spot what I'm doing wrong. Yes my File name extensions is on.
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Chosen solution

For anyone who see this my problem was that an application Zscaler was overriding the general.config.filename property so I could my gfc file was not running.

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Chosen Solution

For anyone who see this my problem was that an application Zscaler was overriding the general.config.filename property so I could my gfc file was not running.