I created a couple of custom schemas in JSON for this new feature. Just cause I'm excited about it! I learned JSON schemas today to do this, so they might be a little basic but maybe someone will find them useful.
Enterprise Connect:
{
    "$schema": "http://json-schema.org/schema#",
    "definitions": {
        "share": {
            "type": "object",
            "properties": {
                "path": {"type": "string"}
            }
        }
    },
    "type": "object",
    "properties": {
        "adRealm": {"type": "string", "default": ""},
        "alwaysGetNewTicket": {"type": "boolean", "default": "false"},
        "checkForNetworkServer": {"type": "string", "default": ""},
        "checkForNetworkType": {"type": "boolean", "default": "false"},
        "checkShowLegacyCertificates": {"type": "boolean", "default": "false"},
        "connectDelay": {"type": "integer", "default": 0, "minimum": 0},
        "connectionCompletedScriptPath": {"type": "string", "default": ""},
        "connectReminderNagInterval": {"type": "integer", "default": 86400, "minimum": 0},
        "connectReminderTime": {"type": "integer", "minimum": 0},
        "dailyReconnectTime": {"type": "integer", "default": 86400, "minimum": 0},
        "debugMode": {"type": "boolean", "default": "false"},
        "destroyKerbTicketUponCardRemoval": {"type": "boolean", "default": "true"},
        "disablePasswordExpirationChecking": {"type": "boolean"},
        "disablePasswordFunctions": {"type": "boolean", "default": "false"},
        "managedshares": {
            "type": "array",
            "items": {"$ref": "#/definitions/share"},
            "default": []
        },
        "mountNetworkHomeDirectory": {"type": "boolean", "default": "false"},
        "orgLogoPath": {"type": "string"},
        "orgUsernameLabel": {"type": "string"},
        "passwordChangeScriptPath": {"type": "string"},
        "passwordChangeURL": {"type": "string"},
        "passwordExpireOverride": {"type": "integer", "minimum": 0},
        "passwordNotificationDays": {"type": "integer", "default": 15, "minimum": 0},
        "preferredDC": {"type": "string"},
        "prepopulatedUsername": {"type": "string", "default": ""},
        "pwReqComplexity": {"type": "boolean", "default": "false"},
        "pwReqComplexityDisableUnicode": {"type": "boolean", "default": "false"},
        "pwReqHistoryCount": {"type": "integer", "minimum": 0},
        "pwReqLength": {"type": "integer", "minimum": 0},
        "pwReqMinimumPasswordAge": {"type": "integer", "minimum": 0},
        "pwReqText": {"type": "string", "default": ""},
        "runAuditScript": {"type": "boolean"},
        "runAuditScriptPath": {"type": "string"},
        "runPasswordChangeScriptOnLocalPasswordSync": {"type": "boolean", "default": "true"},
        "runPeriodicStateCheck": {"type": "boolean", "default": "true"},
        "setupReminderNagInterval": {"type": "integer", "default": 86400, "minimum": 0},
        "shareMountWaitSeconds": {"type": "integer", "default": 0, "minimum": 0},
        "showKeychainIdentities": {"type": "boolean", "default": "false"},
        "showMenuExtra": {"type": "boolean", "default": "true"},
        "showUsernameWithSmartcard": {"type": "boolean", "default": "false"},
        "smartCardMode": {"type": "boolean", "default": "false"},
        "syncLocalPassword": {"type": "boolean"}
    }
}And Firefox:
{
    "$schema": "http://json-schema.org/schema#",
    "definitions": {
        "bookmark": {
            "type": "object",
            "properties": {
                "Folder": {"type": "string"},
                "URL": {"type": "string"},
                "Title": {"type": "string"},
                "Favicon": {"type": "string"},
                "Placement": {"type": "string"}
            }
        }
    },
    "type": "object",
    "properties": {
        "DisableSetDesktopBackground": {"type": "boolean", "default": "true"},
        "Preferences": {
            "type": "object",
            "properties": {
                "app.update.auto": {"type": "boolean", "default": "true"},
                "security.default_personal_cert": {"type": "string", "default": "Ask Every Time"}
              }
        },
        "DisableProfileImport": {"type": "boolean", "default": "true"},
        "DisableSecurityBypass": {
            "type": "object",
            "properties": {
               "InvalidCertificate": {"type": "boolean", "default": "true"},
               "SafeBrowsing": {"type": "boolean", "default": "true"}
            }
       },
        "DNSOverHTTPS":{
            "type": "object",
            "properties": {
               "Enabled": {"type": "boolean", "default": "false"},
               "Locked": { "type": "boolean", "default": "true"},
               "ProviderURL": { "type": "string", "default": "URL_TO_ALTERNATE_PROVIDER" }
           }
        },
        "CaptivePortal": { "type": "boolean", "default": "false" },
        "DisableAppUpdate": { "type": "boolean", "default": "true" },
        "DefaultDownloadDirectory": { "type": "string", "default": "${home}/Downloads" },
        "DontCheckDefaultBrowser": { "type": "boolean", "default": "true" },
        "SSLVersionMin": { "type": "string", "default": "tls1.2" },
        "Certificates":{
            "type": "object",
            "properties": {
               "Install": {
                "type": "array",
                "items": {"type": "string"},
                "default": ["cert1.der","cert2.pem"]
               },
               "ImportEnterpriseRoots": { "type": "boolean", "default": "true" }
            }
        },
        "Homepage":{
            "type": "object",
            "properties": {
               "URL": { "type": "string", "default": "http://example.com" },
               "Additional": {
                "type": "array",
                    "items": {"type": "string"},
                    "default": ["https://www.example.com/extra-home1.htm","https://www.example.com/extra-home2.htm","https://www.example.com/extra-home3.htm"]
                },
               "Locked": { "type": "boolean", "default": "true" },
                "StartPage": { "type": "string", "default": "homepage"}
            }
        },
        "DisableFormHistory": { "type": "boolean", "default": "true" },
        "SupportMenu":{
            "type": "object",
            "properties": {
               "Title": { "type": "string", "default": "Click here for help" },
               "URL": { "type": "string", "default": "http://example.edu/" },
               "AccessKey": { "type": "string", "default": "C" }
            }
        },
        "DisableSafeMode": { "type": "boolean", "default": "true" },
        "ExtensionUpdate": { "type": "boolean", "default": "false" },
        "DisableSystemAddonUpdate": { "type": "boolean", "default": "true" },
        "DisableFirefoxScreenshots": { "type": "boolean", "default": "true"},
        "FlashPlugin":{
            "type": "object",
            "properties": {
                "Allow": {
                    "type": "array",
                    "items": {"type": "string"},
                    "default": ["https://www.example.com"]
                },
               "Block": {
                    "type": "array",
                    "items": {"type": "string"},
                    "default": ["https://www.example.org"]
                },
               "Default": { "type": "boolean", "default": "true" },
               "Locked": { "type": "boolean", "default": "true" }
            }
        },
        "DisableFirefoxAccounts": { "type": "boolean", "default": "true" },
        "ExtensionSettings":{
            "type": "object",
            "properties": {
               "*":{
                "type": "object",
                "properties": {
                      "blocked_install_message": {"type": "string", "default": "Custom error message"},
                      "install_sources": {
                            "type": "array",
                            "items": {"type": "string"},
                            "default": ["https://addons.mozilla.org/"]
                      },
                      "installation_mode": {"type": "string", "default": "blocked"}
                }
               },
               "uBlock0@raymondhill.net":{
                "type": "object",
                "properties": {
                      "installation_mode": {"type": "string", "default": "force_installed"},
                      "install_url": {"type": "string", "default": "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi"}
                }
               }
            }
        },
        "DisplayBookmarksToolbar": { "type": "boolean", "default": "true" },
        "HardwareAcceleration": { "type": "boolean", "default": "false" },
        "DisablePrivateBrowsing": { "type": "boolean", "default": "true" },
        "EnterprisePoliciesEnabled": { "type": "boolean", "default": "false" },
        "Bookmarks": {
            "type": "array",
            "items": {"$ref": "#/definitions/bookmark"},
            "default": [{"Folder":"Example1Folder","URL":"https://www.example.org","Title":"Example1","Favicon":"https://www.example.org/favicon.ico","Placement":"toolbar"},{"Folder":"Example2Folder","URL":"https://www.example.com","Title":"Example2","Favicon":"https://www.example.com/favicon.ico","Placement":"menu"}]
        },
        "NetworkPrediction": { "type": "boolean", "default": "false" },
        "EnableTrackingProtection":{
            "type": "object",
            "properties": {
               "Fingerprinting": { "type": "boolean", "default": "true" },
               "Value": { "type": "boolean", "default": "true" },
               "Locked": { "type": "boolean", "default": "true" },
               "Cryptomining": { "type": "boolean", "default": "true" }
            }
        },
        "OverrideFirstRunPage": {"type": "string", "default": "https://www.example.com"},
        "Extensions":{
            "type": "object",
            "properties": {
               "Install": {
                "type": "array",
                "items": {"type": "string"},
                "default": ["https://addons.mozilla.org/firefox/downloads/file/1053714/ghostery_privacy_ad_blocker-8.2.4-an+fx.xpi"]
               },
               "Uninstall": {
                "type": "array",
                "items": {"type": "string"},
                "default": []
                },
               "Locked":
               {
                "type": "array",
                "items": {"type": "string"},
                "default": ["firefox@ghostery.com"]
                }
            }
        },
        "Authentication":{
            "type": "object",
            "properties": {
               "NTLM": {
                "type": "array",
                "items": {"type": "string"},
                "default": ["mydomain.com","https://myotherdomain.com"]
                },
               "Delegated": {
                "type": "array",
                "items": {"type": "string"},
                "default": ["mydomain.com","https://myotherdomain.com"]
               },
               "AllowNonFQDN":{
                "type": "object",
                "properties": {
                    "SPNEGO": { "type": "boolean", "default": "true" },
                    "NTLM": { "type": "boolean", "default": "true" }
                }
               },
               "AllowProxies":{
                "type": "object",
                "properties": {
                      "SPNEGO": { "type": "boolean", "default": "true" },
                      "NTLM": { "type": "boolean", "default": "true" }
                    }
               },
               "Locked": { "type": "boolean", "default": "true" },
               "SPNEGO": {
                "type": "array",
                "items": {"type": "string"},
                "default": ["mydomain.com","https://myotherdomain.com"]
                }
           }
        },
        "Proxy":{
            "type": "object",
            "properties": {
               "SocksVersion": {"type": "string", "default": "4"},
               "Mode": {"type": "string", "default": "manual"},
               "HTTPProxy": {"type": "string", "default": "proxy.example.com:80"},
            "Locked": { "type": "boolean", "default": "true" }
            }
        },
        "SecurityDevices":{
            "type": "object",
            "properties": {
               "NAME_OF_DEVICE": {"type": "string", "default": "PATH_TO_LIBRARY_FOR_DEVICE"}
            }
        },
        "OverridePostUpdatePage": {"type": "string", "default": ""},
        "BlockAboutSupport": { "type": "boolean", "default": "true" },
        "LocalFileLinks": {
            "type": "array",
            "items": {"type": "string"},
            "default": ["http://example.org","http://example.edu"]
        },
        "Permissions":{
            "type": "object",
            "properties": {
               "Camera":{
                "type": "object",
                "properties": {
                      "Allow": {
                        "type": "array",
                        "items": {"type": "string"},
                        "default": ["https://example.org"]
                        },
                      "BlockNewRequests": { "type": "boolean", "default": "true" },
                      "Block": {
                        "type": "array",
                        "items": {"type": "string"},
                        "default": ["https://example.edu"]
                        },
                      "Locked": { "type": "boolean", "default": "true" }
                    }
               },
               "Microphone":{
                "type": "object",
                "properties": {
                      "Allow": {
                        "type": "array",
                        "items": {"type": "string"},
                        "default": ["https://example.org"]
                        },
                      "BlockNewRequests": { "type": "boolean", "default": "true" },
                      "Block": {
                      "type": "array",
                      "items": {"type": "string"},
                      "default": ["https://example.edu"]
                      },
                      "Locked": { "type": "boolean", "default": "true" }
                    }
               },
               "Location":{
                "type": "object",
                "properties": {
                      "Allow": {
                        "type": "array",
                        "items": {"type": "string"},
                        "default": ["https://example.org"]
                        },
                      "BlockNewRequests": { "type": "boolean", "default": "true" },
                      "Block": {
                      "type": "array",
                      "items": {"type": "string"},
                      "default": ["https://example.edu"]
                      },
                      "Locked": { "type": "boolean", "default": "true" }
                    }
               },
               "Notifications":{
                "type": "object",
                "properties": {
                      "Allow": {
                        "type": "array",
                        "items": {"type": "string"},
                        "default": ["https://example.org"]
                        },
                      "BlockNewRequests": { "type": "boolean", "default": "true" },
                      "Block": {
                      "type": "array",
                      "items": {"type": "string"},
                      "default": ["https://example.edu"]
                      },
                      "Locked": { "type": "boolean", "default": "true" }
                    }
               }
            }
        } ,
        "PasswordManagerEnabled": { "type": "boolean", "default": "false" },
        "NoDefaultBookmarks": { "type": "boolean", "default": "true" },
        "FirefoxHome":{
            "type": "object",
            "properties": {
               "TopSites": { "type": "boolean", "default": "true" },
               "Pocket": { "type": "boolean", "default": "false" },
               "Search": { "type": "boolean", "default": "true" },
               "Snippets": { "type": "boolean", "default": "false" },
               "Locked": { "type": "boolean", "default": "true" },
               "Highlights": { "type": "boolean", "default": "true" }
            }
        },
        "DisableFeedbackCommands": { "type": "boolean", "default": "true" },
        "DisablePasswordReveal": { "type": "boolean", "default": "true" },
        "AppUpdateURL": {"type": "string", "default": "https://www.example.com/update.xml"},
        "DisableTelemetry": { "type": "boolean", "default": "true" },
        "DisableDeveloperTools": { "type": "boolean", "default": "true" },
        "SearchBar": {"type": "string", "default": "separate"},
        "WebsiteFilter":{
            "type": "object",
            "properties": {
               "Block": {
                "type": "array",
                "items": {"type": "string"},
                "default": ["<all_urls>"]
               },
               "Exceptions": {
                    "type": "array",
                    "items": {"type": "string"},
                    "default": ["https://www.google.com/*","https://www.yahoo.com/*"]
                }
            }
        },
        "DisableFirefoxStudies": { "type": "boolean", "default": "true" },
        "DownloadDirectory": {"type": "string", "default": "${home}/Downloads"},
        "BlockAboutConfig": { "type": "boolean", "default": "true" },
        "DisableMasterPasswordCreation": { "type": "boolean", "default": "true" },
        "SanitizeOnShutdown": { "type": "boolean", "default": "true" },
        "InstallAddonsPermission":{
            "type": "object",
            "properties": {
               "Allow": {
                "type": "array",
                "items": {"type": "string"},
                "default": ["https://example.org","https://example.edu"]
               },
               "Default": { "type": "boolean", "default": "false" }
            }
        },
        "DisablePocket": { "type": "boolean", "default": "true" },
        "DisableBuiltinPDFViewer": { "type": "boolean", "default": "true" },
        "DisableProfileRefresh": { "type": "boolean", "default": "true" },
        "NewTabPage": { "type": "boolean", "default": "false" },
        "OfferToSaveLoginsDefault": { "type": "boolean", "default": "false" },
        "OfferToSaveLogins": { "type": "boolean", "default": "false" },
        "SSLVersionMax": {"type": "string", "default": "tls1.3"},
        "BlockAboutAddons": { "type": "boolean", "default": "true" },
        "RequestedLocales": {
            "type": "array",
            "items": {"type": "string"},
            "default": ["de","en-US"]
        },
        "BlockAboutProfiles": { "type": "boolean", "default": "true" },
        "Cookies":{
            "type": "object",
            "properties": {
               "Locked": { "type": "boolean", "default": "true" },
               "ExpireAtSessionEnd": { "type": "boolean", "default": "true" },
               "Default": { "type": "boolean", "default": "false" },
               "Allow": {
                "type": "array",
                "items": {"type": "string"},
                "default": ["https://www.example.org/"]
               },
               "RejectTracker": { "type": "boolean", "default": "true" },
               "Block": {
                "type": "array",
                "items": {"type": "string"},
                "default": ["https://www.example.edu/"]
               },
               "AcceptThirdParty": {"type": "string", "default": "never"}
            }
        },
        "DisableForgetButton": { "type": "boolean", "default": "true" },
        "PopupBlocking":{
            "type": "object",
            "properties": {
               "Allow": {
                "type": "array",
                "items": {"type": "string"},
                "default": ["https://www.example.org","https://www.example.edu"]
               },
               "Default": { "type": "boolean", "default": "true" },
               "Locked": { "type": "boolean", "default": "true" }
            }
        }
    } 
}








