mozilla.cfg/config/distribution/policies.json

{
	"policies": {

    "AppUpdateURL": "https://aus5.mozilla.org/update/6/%PRODUCT%/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%CHANNEL%/%OS_VERSION%/%SYSTEM_CAPABILITIES%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/update.xml",

    "CaptivePortal": false,

    "Certificates": {
      "ImportEnterpriseRoots": false
    },

    "Cookies": {
      "Allow": ["http://example.org/"],
      "Block": ["http://example.edu/"],
      "Default": true,
      "ExpireAtSessionEnd": false,
      "Locked": false
    },

    "DisableSetDesktopBackground": true,

    "DisableMasterPasswordCreation": true,

    "DisableFeedbackCommands": true,

    "DisableFirefoxScreenshots": true,

    "DisableFirefoxAccounts": true,

    "DisableFirefoxStudies": true,

    "DisablePocket": true,

    "DisableProfileImport": true,

    "DisableProfileRefresh": true,

    "DisableSecurityBypass": {
      "InvalidCertificate": true,
      "SafeBrowsing": true
    },

    "DisableSystemAddonUpdate": false,

    "DisableTelemetry": true,

    "DontCheckDefaultBrowser": true,

    "EnableTrackingProtection": {
      "Value": false,
      "Locked": true
    },

    "Extensions": {
      "Install_remove_me": ["https://addons.mozilla.org/firefox/downloads/latest/example_0-ublock-origin/latest.xpi", "//path/to/xpi"],
      "Uninstall": ["bad_addon_id@mozilla.org", "twitter@search.mozilla.org"],
      "Locked":  ["addon_id@mozilla.org"]
    },

    "ExtensionUpdate": true,

    "FlashPlugin": {
      "Allow": ["http://example.org/"],
      "Block": ["http://example.edu/"],
      "Default": false,
      "Locked": false
    },

    "FirefoxHome": {
      "Search": false,
      "TopSites": false,
      "Highlights": false,
      "Pocket": false,
      "Snippets": false,
      "Locked": true
    },

    "Homepage": {
      "URL": "about:blank",
      "Locked": true,
      "Additional": ["http://example.org/",
                     "http://example.edu/"],
      "StartPage": "none"
    },

    "NewTabPage": false,

    "NetworkPrediction": false,

    "NoDefaultBookmarks": true,

    "OfferToSaveLogins": false,

    "OverrideFirstRunPage": "",

    "OverridePostUpdatePage": "",

    "Permissions": {
      "Camera": {
        "Allow": ["https://example.org"],
        "Block": ["https://example.edu"],
        "BlockNewRequests": true,
        "Locked": true
      },
      "Microphone": {
        "Allow": ["https://example.org"],
        "Block": ["https://example.edu"],
        "BlockNewRequests": true,
        "Locked": true
      },
      "Location": {
        "Allow": ["https://example.org"],
        "Block": ["https://example.edu"],
        "BlockNewRequests": true,
        "Locked": true
      },
      "Notifications": {
        "Allow": ["https://example.org"],
        "Block": ["https://example.edu"],
        "BlockNewRequests": true,
        "Locked": true
      }
    },

    "PopupBlocking": {
      "Allow": ["http://example.org/",
                "http://example.edu/"],
      "Default": true,
      "Locked": true
    },

    "SearchEngines": {
	    	"Default": "DuckDuckGo",
	    	"PreventInstalls": false,
	    	"Remove": ["Bing", "Google", "Twitter"]
    },

    "SearchSuggestEnabled": false,

    "SSLVersionMin": "tls1.2"

	}
}