foxgirl-settings/librewolf.cfg/user-settings/dnt.json

{
    "name": "Do Not Track",
    "subcategory": "User Settings",
    "notes": "",
    "section": [
        {
            "comments": "",
            "type": "lockPref",
            "key": "privacy.donottrackheader.enabled",
            "value": true
        },

        {
            "comments": "",
            "type": "lockPref",
            "key": "privacy.donottrackheader.value",
            "value": 1
        }
    ]
}