Example on a Firefox ESR setting files in relation to https://infosec.exchange/@iampytest1/111042104329673915

policies.json

{
    "policies": {
        "AppAutoUpdate": true,
        "AutoLaunchProtocolsFromOrigins": [
            {
                "protocol": "http",
                "allowed_origins": [
                    "http://example.org"
                ]
            }
        ],
        "AllowedDomainsForApps": "invalid.test",
        "BackgroundAppUpdate": true,
        "BlockAboutAddons": false,
        "BlockAboutProfiles": false,
        "BlockAboutSupport": false,
        "CaptivePortal": false,
        "Cookies": {
            "Allow": [
                "http://example.org",
                "https://mypdns.org"
            ],
            "AllowSession": [
                "http://example.org",
                "https://mypdns.org"
            ],
            "Block": [
                "https://google.com/"
            ],
            "ExpireAtSessionEnd": true,
            "Locked": false,
            "Behavior": "reject-tracker-and-partition-foreign",
            "BehaviorPrivateBrowsing": "reject-tracker-and-partition-foreign"
        },
        "DefaultDownloadDirectory": "${HOME}/Downloads",
        "DisableDefaultBrowserAgent": true,
        "DisableFeedbackCommands": true,
        "DisableFirefoxAccounts": false,
        "DisableFirefoxScreenshots": false,
        "DisableFirefoxStudies": true,
        "DisableMasterPasswordCreation": true,
        "DisablePasswordReveal": false,
        "DisablePocket": true,
        "DisablePrivateBrowsing": false,
        "DisableSafeMode": false,
        "DisableSecurityBypass": {
            "InvalidCertificate": false,
            "SafeBrowsing": false
        },
        "DisableSetDesktopBackground": true,
        "DisableSystemAddonUpdate": false,
        "DisableTelemetry": true,
        "DisplayBookmarksToolbar": false,
        "DisplayMenuBar": "default-off",
        "DNSOverHTTPS": {
            "Enabled": false,
            "ProviderURL": "https://dns10.quad9.net/dns-query",
            "Locked": false,
            "ExcludedDomains": [
                "http://example.org",
                "https://mypdns.org"
            ]
        },
        "DontCheckDefaultBrowser": true,
        "EnableTrackingProtection": {
            "Value": true,
            "Locked": false,
            "Cryptomining": true,
            "Fingerprinting": true
        },
        "Extensions": {
            "Uninstall": [
                "[email protected]",
                "[email protected]",
                "[email protected]",
                "[email protected]",
                "[email protected]",
                "[email protected]"
            ]
        },
        "ExtensionSettings": {
            "@canvas-shadow": {
                "installation_mode": "force_installed",
                "install_url": "https://addons.mozilla.org/firefox/downloads/latest/no-canvas-fingerprinting/latest.xpi",
                "allowed_types": [
                    "extension"
                ]
            },
            "{73a6fe31-595d-460b-a920-fcc0f8843232}": {
                "installation_mode": "normal_installed",
                "install_url": "https://addons.mozilla.org/firefox/downloads/latest/noscript/latest.xpi",
                "allowed_types": [
                    "extension"
                ]
            },
            "[email protected]": {
                "installation_mode": "normal_installed",
                "install_url": "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi"
            },
            "[email protected]": {
                "installation_mode": "normal_installed",
                "install_url": "https://addons.mozilla.org/firefox/downloads/latest/cookie-autodelete/latest.xpi"
            },
            "jid1-BoFifL9Vbdl2zQ@jetpack": {
                "installation_mode": "normal_installed",
                "allowed_types": [
                    "extension"
                ],
                "install_url": "https://addons.mozilla.org/firefox/downloads/latest/decentraleyes/latest.xpi"
            },
            "[email protected]": {
                "installation_mode": "blocked"
            },
            "[email protected]": {
                "installation_mode": "blocked"
            },
            "[email protected]": {
                "installation_mode": "blocked"
            },
            "[email protected]": {
                "installation_mode": "blocked"
            },
            "[email protected]": {
                "installation_mode": "blocked"
            },
            "[email protected]": {
                "blocked_install_message": "No thanks, we like privacy.",
                "install_sources": [
                    "https://addons.mozilla.org/*"
                ],
                "installation_mode": "blocked",
                "allowed_types": [
                    "extension"
                ]
            },
            "[email protected]": {
                "blocked_install_message": "No thanks, we like privacy.",
                "install_sources": [
                    "https://addons.mozilla.org/*"
                ],
                "installation_mode": "blocked",
                "allowed_types": [
                    "extension"
                ]
            },
            "[email protected]": {
                "blocked_install_message": "No thanks, we like privacy.",
                "install_sources": [
                    "https://addons.mozilla.org/*"
                ],
                "installation_mode": "blocked",
                "allowed_types": [
                    "extension"
                ]
            },
            "[email protected]": {
                "blocked_install_message": "No thanks Elon Musk.",
                "install_sources": [
                    "https://addons.mozilla.org/*"
                ],
                "installation_mode": "blocked",
                "allowed_types": [
                    "extension"
                ]
            },
            "[email protected]": {
                "blocked_install_message": "No thanks, we like privacy.",
                "install_sources": [
                    "https://addons.mozilla.org/*"
                ],
                "installation_mode": "blocked",
                "allowed_types": [
                    "extension"
                ]
            }
        },
        "ExtensionUpdate": true,
        "FirefoxHome": {
            "Search": true,
            "TopSites": false,
            "SponsoredTopSites": false,
            "Highlights": false,
            "Pocket": false,
            "SponsoredPocket": false,
            "Snippets": false,
            "Locked": true
        },
        "InstallAddonsPermission": {
            "Allow": [
                "https://mypdns.org",
                "https://example.org"
            ],
            "Default": true
        },
        "GoToIntranetSiteForSingleWordEntryInAddressBar": true,
        "HardwareAcceleration": false,
        "Homepage": {
            "URL": "https://mypdns.org/",
            "Locked": false,
            "Additional": [
                "https://mypdns.org/",
                "http://example.org/"
            ],
            "StartPage": "previous-session"
        },
        "EncryptedMediaExtensions": {
            "Enabled": false,
            "Locked": true
        },
        "ManualAppUpdateOnly": false,
        "NetworkPrediction": false,
        "NoDefaultBookmarks": false,
        "OfferToSaveLogins": false,
        "OverrideFirstRunPage": "http://example.org",
        "OverridePostUpdatePage": "http://example.org",
        "PasswordManagerEnabled": false,
        "PDFjs": {
            "Enabled": false,
            "EnablePermissions": false
        },
        "Permissions": {
            "Camera": {
                "BlockNewRequests": true,
                "Locked": false
            },
            "Microphone": {
                "BlockNewRequests": true,
                "Locked": false
            },
            "Location": {
                "Allow": [
                    "https://example.org"
                ],
                "BlockNewRequests": true,
                "Locked": false
            },
            "Notifications": {
                "Allow": [
                    "http://example.org",
                    "https://mypdns.org"
                ],
                "BlockNewRequests": true,
                "Locked": false
            },
            "Autoplay": {
                "Allow": [
                    "http://example.org",
                    "https://mypdns.org"
                ],
                "Default": "block-audio-video",
                "Locked": false
            }
        },
        "PictureInPicture": {
            "Enabled": false,
            "Locked": true
        },
        "PopupBlocking": {
            "Default": false,
            "Locked": true,
            "Allow": [
                "http://example.org",
                "https://mypdns.org"
            ]
        },
        "Preferences": {
            "accessibility.force_disabled": {
                "Value": 1,
                "Status": "default"
            },
            "browser.tabs.warnOnClose": {
                "Value": false,
                "Status": "locked"
            }
        },
        "PrimaryPassword": false,
        "PromptForDownloadLocation": true,
        "RequestedLocales": [
            "en-GB"
        ],
        "SanitizeOnShutdown": {
            "Cache": true,
            "Cookies": true,
            "Downloads": true,
            "FormData": true,
            "History": false,
            "Sessions": false,
            "SiteSettings": false,
            "OfflineApps": true,
            "Locked": false
        },
        "SearchBar": "unified",
        "SearchEngines": {
            "Default": "DuckDuckGo",
            "Add": [
                {
                    "Name": "My Privacy DNS",
                    "URLTemplate": "https://mypdns.org/search?scope=issues&search={searchTerms}",
                    "Method": "POST",
                    "IconURL": "https://mypdns.org/favicon.ico",
                    "Alias": "@m",
                    "Description": "My Privacy DNS Domain searcher",
                    "PostData": "name=value&q={searchTerms}"
                }
            ],
            "Remove": [
                "Amazon.com",
                "Amazon.de",
                "Bing",
                "eBay",
                "Google",
                "Twitter",
                "Wikipedia (de)",
                "Wikipedia (en)"
            ]
        },
        "SearchSuggestEnabled": false,
        "SupportMenu": {
            "Title": "Support Menu",
            "URL": "https://example.org",
            "AccessKey": "S"
        },
        "UserMessaging": {
            "WhatsNew": true,
            "ExtensionRecommendations": true,
            "FeatureRecommendations": true,
            "UrlbarInterventions": true,
            "SkipOnboarding": true,
            "MoreFromMozilla": true
        },
        "WebsiteFilter": {
            "Block": [
                "*://google.*/",
                "*://*.google.*/"
            ],
            "Exceptions": [
                "https://mypdns.org/",
                "https://*.mypdns.org/"
            ]
        }
    }
}