{ "user": { "Safe Browsing": { "description": "Google Safe Browsing is a service from Google that warns users when they attempt to navigate to a dangerous website or download dangerous files.", "preferences": { "browser.safebrowsing.downloads.remote.enabled": { "value": false, "title": "Disable Google Safe Browsing for downloads", "description": "To verify the safety of certain executable files, GeckoView may submit some information about the file, including the name, origin, size and a cryptographic hash of the contents, to the Google Safe Browsing service which helps GeckoView determine whether or not the file should be blocked.", "requireUserOptIn": true } } }, "Block Implicit Outbound": { "description": "Control not explicitly user invoked interactions", "preferences": { "network.prefetch-next": { "value": false, "title": "Disable link prefetching", "shouldBeDefault": true }, "network.dns.disablePrefetch": { "value": true, "title": "Disable DNS prefetching", "shouldBeDefault": true }, "network.dns.disablePrefetchFromHTTPS": { "value": true, "title": "Disable HTTPS DNS prefetching" }, "network.predictor.enabled": { "value": false, "title": "Disable prefetching predictor", "shouldBeDefault": true }, "network.predictor.enable-prefetch": { "value": false, "title": "Disable prefetching predictions", "shouldBeDefault": true }, "network.http.speculative-parallel-limit": { "value": 0, "title": "Disable link-mouseover opening connection to linked server", "shouldBeDefault": true }, "network.preconnect": { "value": false, "title": "Disable automatic connections to third-party domains," } } }, "DNS": { "description": "Improve DNS and Proxy/SOCKS security", "preferences": { "network.trr.mode": { "value": 3, "title": "Enable DNS over HTTPS", "requireUserOptIn": true }, "network.trr.uri": { "value": "https://dns.quad9.net/dns-query", "title": "Use quad9 for Trusted Recursive Resolver (TRR)", "description": "Quad9 is a privacy-focused DNS resolver that provides malware blocking and security features.", "requireUserOptIn": true }, "network.trr.custom.uri": { "value": "https://dns.quad9.net/dns-query", "title": "Use quad9 for custom Trusted Recursive Resolver (TRR)", "description": "Quad9 is a privacy-focused DNS resolver that provides malware blocking and security features.", "requireUserOptIn": true }, "network.dns.native_https_query": { "value": true, "title": "Enable native DNS HTTPS Query", "description": "DNS over HTTPS", "shouldBeDefault": true }, "network.proxy.socks_remote_dns": { "value": true, "title": "Set the proxy server to do any DNS lookups when using SOCKS", "description": "e.g. in Tor, this stops your local DNS server from knowing your Tor destination as a remote Tor node will handle the DNS request" }, "network.file.disable_unc_paths": { "value": true, "title": "Disable using UNC (Uniform Naming Convention) paths", "description": "Warning: Can break extensions for profiles on network shares", "requireUserOptIn": true }, "network.gio.supported-protocols": { "value": "", "title": "Disable GIO as a potential proxy bypass vector" }, "media.peerconnection.ice.proxy_only_if_behind_proxy": { "value": true, "title": "Force WebRTC inside the proxy" }, "media.peerconnection.enabled": { "value": false, "title": "Disable WebRTC PeerConnection", "description": "Prevent exposing local IP Address" }, "media.peerconnection.ice.default_address_only": { "value": true, "title": "Force a single network interface for ICE candidates generation", "description": "When using a system-wide proxy, it uses the proxy interface" }, "network.dns.localDomains": { "value": "250analytics.com,a.omappapi.com,activity-stream-icons.services.mozilla.com,ads.allizom.org,ads.mozilla.org,ads.nonprod.webservices.mozgcp.net,ads.prod.webservices.mozgcp.net,ads-img.mozilla.org,analytics.getpocket.com,analytics.google.com,analytics.withgoogle.com,anf1.fuzzing.mozilla.org,anonymco.com,api.divviup.org,asan-nightly-frontend-elb-1348905149.us-east-2.elb.amazonaws.com,braze.com,contile.services.mozilla.com,contile-images.services.mozilla.com,classify-client.nonprod.webservices.mozgcp.net,classify-client.prod.webservices.mozgcp.net,classify-client.services.mozilla.com,crash-reports.allizom.org,crash-reports.mozilla.com,crash-reports-xpsp2.mozilla.com,crash-stacks.mozilla.com,crash-stats.allizom.org,crash-stats.mozilla.com,crash-stats.mozilla.org,dap.services.mozilla.com,dap.nonprod.webservices.mozgcp.net,dap.prod.webservices.mozgcp.net,dap-09-3.api.divviup.org,data.mozilla.com,data-ingestion.prod.dataops.mozgcp.net,dataops.mozgcp.net,dataservices.mozgcp.net,discovery.addons.allizom.org,discovery.addons.mozilla.org,discovery.addons-dev.allizom.org,divviup.org,download-stats.mozilla.org,download-stats.r53-2.services.mozilla.com,experimenter.services.mozilla.com,experimenter.nonprod.webservices.mozgcp.net,experimenter.prod.webservices.mozgcp.net,fhr.data.mozilla.com,fhr.r53-2.services.mozilla.com,firefox-android-home-recommendations.getpocket.com,firefox-dns-perf-test.net,fuzzing.mozilla.org,google-analytics.com,google-analytics-cn.com,googleanalytics.com,googlesyndication.com,googlesyndication-cn.com,googletagmanager.com,googletagmanager-cn.com,googletagservices.com,googletagservices-cn.com,improving.duckduckgo.com,incoming.telemetry.mozilla.org,incoming.thunderbird.net,incoming-telemetry.thunderbird.net,ingestion-edge.prod.dataops.mozgcp.net,location.services.mozilla.com,locprod1-elb-eu-west-1.prod.mozaws.net,locprod2-elb-us-west-2.prod.mozaws.net,metrics-content.duckduckgo.com,new-sentry.gitlab.net,nonprod.classify-client.nonprod.webservices.mozgcp.net,normandy.cdn.mozilla.net,normandy.nonprod.cloudops.mozgcp.net,normandy.prod.cloudops.mozgcp.net,normandy-cdn.services.mozilla.com,omappapi.com,pagead2.googlesyndication.com,pipeline-incoming-prod-elb-149169523.us-west-2.elb.amazonaws.com,prod.ads.prod.webservices.mozgcp.net,prod.classify-client.prod.webservices.mozgcp.net,prod.dap.prod.webservices.mozgcp.net,prod.data-ingestion.prod.dataops.mozgcp.net,prod.dataops.mozgcp.net,prod.experimenter.prod.webservices.mozgcp.net,prod.ingestion-edge.prod.dataops.mozgcp.net,prod.sentry.prod.cloudops.mozgcp.net,prod-classifyclient.normandy.prod.cloudops.mozgcp.net,sdk.iad-05.braze.com,search.r53-2.services.mozilla.com,search.services.mozilla.com,self-repair.mozilla.org,self-repair.r53-2.services.mozilla.com,sentry.gitlab.net,sentry.io,sentry.nonprod.cloudops.mozgcp.net,sentry.prod.cloudops.mozgcp.net,sentry.prod.mozaws.net,sitereview.zscaler.com,snippets.allizom.org,snippets.cdn.mozilla.net,snippets.mozilla.com,snippets-prod.frankfurt.moz.works,snippets-prod.moz.works,snippets-prod.oregon-b.moz.works,snippets-stage.moz.works,snippets-stage.oregon-b.moz.works,snowplow.trx.gitlab.net,snowplowalb-1011729428.us-east-1.elb.amazonaws.com,snowplowprd.trx.gitlab.net,snowplowprdnlb-1490493263.us-east-2.elb.amazonaws.com,socorro.nonprod.webservices.mozgcp.net,socorro.prod.webservices.mozgcp.net,socorro-collector.services.mozilla.com,socorro-webapp-allizom.stage.mozaws.net,socorro-webapp.services.mozilla.com,spocs.getpocket.com,spocs.getpocket.dev,spocs.mozilla.net,ssl.google-analytics.com,ssl-google-analytics.l.google.com,stage.sentry.nonprod.cloudops.mozgcp.net,start.fedoraproject.org,start.thunderbird.net,start.ubuntu.com,start-stage.thunderbird.net,survey.mozilla.com,tagmanager.google.com,talkback.mozilla.org,talkback-public.mozilla.org,talkback-reports.mozilla.org,telemetry-coverage.mozilla.org,telemetry-coverage.r53-2.services.mozilla.com,telemetry-experiment.cdn.mozilla.net,telemetry-incoming.r53-2.services.mozilla.com,telemetry-incoming-a.r53-2.services.mozilla.com,telemetry-incoming-b.r53-2.services.mozilla.com,telemetry-prod-1054754349.us-east-1.elb.amazonaws.com,tiles-cdn.prod.ads.prod.webservices.mozgcp.net,updates.thunderbird.net,updates-stage.thunderbird.net,use-application-dns.net,vf.startpage.com,widgets.getpocket.com,www.250analytics.com,www.anonymco.com,www.google-analytics.com,www.google-analytics-cn.com,www.googleanalytics.com,www.googlesyndication.com,www.googlesyndication-cn.com,www.googletagmanager.com,www.googletagmanager-cn.com,www.googletagservices.com,www.googletagservices-cn.com,www.sentry.io,www-google-analytics.l.google.com,www-googletagmanager.l.google.com", "title": "Block Tracking Domains" }, "network.proxy.type": { "value": 0, "title": "Prevents using automatically the system's proxy configuration by default" } } }, "Secure Connections": { "description": "SSL/TLS / OCSP / CERTS / HPKP", "preferences": { "security.ssl.require_safe_negotiation": { "value": true, "title": "Require safe negotiation", "description": "Blocks connections to servers that don't support RFC 5746 as they're potentially vulnerable to a MiTM attack." }, "security.tls.enable_0rtt_data": { "value": false, "title": "Disable TLS1.3 0-RTT (round-trip time)", "description": "This data is not forward secret, as it is encrypted solely under keys derived using the offered PSK. There are no guarantees of non-replay between connections." }, "security.OCSP.enabled": { "value": 1, "title": "Enforce OCSP fetching to confirm current validity of certificates" }, "security.OCSP.require": { "value": true, "title": "Set OCSP fetch failures to hard-fail", "description": "When a CA cannot be reached to validate a cert, GeckoView just continues the connection (=soft-fail). Setting this pref to true tells GeckoView to instead terminate the connection (=hard-fail)." }, "security.cert_pinning.enforcement_level": { "value": 2, "title": "Enable strict PKP (Public Key Pinning)" }, "security.remote_settings.crlite_filters.enabled": { "value": true, "title": "Enable CRLite" }, "security.pki.crlite_mode": { "value": 2, "title": "Enable CRLite for PKI", "shouldBeDefault": true }, "security.tls.enable_kyber": { "value": true, "title": "Enable Post-Quantum Kyber TLS" }, "network.http.http3.enable_kyber": { "value": true, "title": "Enable HTTP3 Post-Quantum Kyber TLS" }, "security.ssl.treat_unsafe_negotiation_as_broken": { "value": true, "title": "Display warning on the padlock for 'broken security'" }, "browser.xul.error_pages.expert_bad_cert": { "value": true, "title": "Display advanced information on Insecure Connection warning pages" }, "dom.security.https_first": { "value": true, "title": "Attempt to establish HTTPS connections first before falling back to HTTP", "shouldBeDefault": true } } }, "Privacy": { "preferences": { "network.http.referer.XOriginTrimmingPolicy": { "value": 2, "title": "Trim cross-origin referrers", "description": "Trims down referrers to just the scheme, hostname and port" }, "network.http.referer.XOriginPolicy": { "value": 2, "title": "Only send cross-origin referer if host matches" }, "network.http.referer.disallowCrossSiteRelaxingDefault": { "value": true, "title": "Disallow relaxing referrer policy for cross-site requests", "shouldBeDefault": true }, "network.http.referer.disallowCrossSiteRelaxingDefault.top_navigation": { "value": true, "title": "Disallow relaxing referrer policy for cross-site requests", "description": "On top navigation", "shouldBeDefault": true }, "general.useragent.updates.enabled": { "value": false, "title": "Disable automatic User Agent updates", "description": "This preference controls whether Firefox automatically updates its User-Agent string. When set to false, it prevents Firefox from automatically updating the browser's User-Agent string, which is a text identifier that tells websites which browser and version you're using." }, "privacy.query_stripping.enabled": { "value": true, "title": "Strip known tracking query parameters from URLs" }, "privacy.query_stripping.enabled.pbmode": { "value": true, "title": "Strip known tracking query parameters from URLs (Private browsing)" }, "privacy.query_stripping.strip_list": { "value": "__hsfp __hssc __hstc __s _bhlid _branch_match_id _branch_referrer _gl _hsenc _kx _openstat at_recipient_id at_recipient_list bbeml bsft_clkid bsft_uid dclid et_rid fb_action_ids fb_comment_id fbclid gbraid gclid guce_referrer guce_referrer_sig hsCtaTracking igshid irclickid mc_eid mkt_tok ml_subscriber ml_subscriber_hash msclkid mtm_cid oft_c oft_ck oft_d oft_id oft_ids oft_k oft_lk oft_sk oly_anon_id oly_enc_id pk_cid rb_clickid s_cid sc_customer sc_eh sc_uid srsltid ss_email_id twclid unicorn_click_id vero_conv vero_id vgo_ee wbraid wickedid yclid ymclid ysclid", "title": "Improve built-in query stripping" }, "dom.private-attribution.submission.enabled": { "value": false, "title": "Disable Private Attribution Submission Control", "shouldBeDefault": true }, "privacy.trackingprotection.enabled": { "value": true, "title": "Enable Tracking Protection" }, "privacy.trackingprotection.pbmode.enabled": { "value": true, "title": "Enable Tracking Protection (Private browsing)" }, "privacy.trackingprotection.socialtracking.enabled": { "value": true, "title": "Enable Social Tracking Protection", "shouldBeDefault": true }, "privacy.trackingprotection.cryptomining.enabled": { "value": true, "title": "Enable Cryptomining Protection", "shouldBeDefault": true }, "privacy.trackingprotection.fingerprinting.enabled": { "value": true, "title": "Enable Fingerprinting Tracking Protection", "shouldBeDefault": true }, "network.cookie.maxageCap": { "value": 15552000, "title": "Limit maximum cookie lifetime to 180 days" } } }, "Resist Fingerprinting": { "description": "Advanced Fingerprinting protection. This might break websites. For best results make sure to enable \"Privacy\" hardenings.", "preferences": { "privacy.fingerprintingProtection": { "value": true, "title": "Enable Suspected Fingerprinters Protection (FPP)", "shouldBeDefault": true }, "privacy.fingerprintingProtection.pbmode": { "value": true, "title": "Enable Suspected Fingerprinters Protection (FPP) (Private browsing)", "shouldBeDefault": true }, "privacy.reduceTimerPrecision": { "value": true, "title": "Reduce timer precision", "shouldBeDefault": true }, "privacy.partition.network_state.ocsp_cache": { "value": true, "title": "Enable OCSP cache", "shouldBeDefault": true }, "privacy.partition.network_state.ocsp_cache.pbmode": { "value": true, "title": "Enable OCSP cache (Private browsing)", "shouldBeDefault": true }, "gfx.bundled-fonts.activate": { "value": 1, "title": "Always load bundled fonts" } } }, "Attack Surface Reduction": { "preferences": { "pdfjs.enableScripting": { "value": false, "title": "Disable PDFJS scripting" }, "pdfjs.enableXfa": { "value": false, "title": "Disable PDFJS XFA" }, "mathml.disabled": { "value": true, "title": "Disable MathML (Mathematical Markup Language)" }, "gfx.font_rendering.graphite.enabled": { "value": false, "title": "Disable graphite" }, "javascript.options.ion": { "value": false, "title": "Disable Ion" }, "javascript.options.baselinejit": { "value": false, "title": "Disable baseline JIT" }, "javascript.options.jit_trustedprincipals": { "value": false, "title": "Disable JIT trustedprincipals" }, "javascript.options.asmjs": { "value": false, "title": "Disable asm.js" }, "javascript.options.wasm": { "value": false, "title": "Disable web assembly", "requireUserOptIn": true }, "accessibility.force_disabled": { "value": 1, "title": "Disable Accessibility Services" } } }, "Disk Avoidance": { "description": "Control what data to persist to disk", "preferences": { "browser.cache.disk.enable": { "value": false, "title": "Disable disk cache", "description": "Don't cache data to disk. Might impact performance negatively", "requireUserOptIn": true }, "browser.privatebrowsing.forceMediaMemoryCache": { "value": true, "title": "Set media cache in Private Browsing to in-memory" }, "media.memory_cache_max_size": { "value": 65536, "title": "Increase in-memory media cache maximum size" }, "browser.sessionstore.privacy_level": { "value": 2, "title": "Disable storing extra session data", "description": "Extra session data such as form content, cookies and POST data" } } }, "PDFJS": { "preferences": { "pdfjs.enableSignatureEditor": { "value": true, "title": "Enable the ability to add signatures" }, "pdfjs.enablePermissions": { "value": false, "title": "Never allow documents to prevent copying text", "shouldBeDefault": true }, "pdfjs.externalLinkTarget": { "value": 2, "title": "Open external links in new tabs/windows" }, "pdfjs.sidebarViewOnLoad": { "value": 2, "title": "Show sidebar by default when viewing PDFs" } } }, "Miscelaneous": { "preferences": { "permissions.manager.defaultsUrl": { "value": "", "title": "Remove special permissions for certain mozilla domains" }, "network.IDN_show_punycode": { "value": true, "title": "Use Punycode in Internationalized Domain Names to eliminate possible spoofing" }, "extensions.postDownloadThirdPartyPrompt": { "value": false, "title": "Disable bypassing 3rd party extension install prompts" }, "layout.css.visited_links_enabled": { "value": false, "title": "Disable coloring of visited links", "requireUserOptIn": true }, "media.autoplay.default": { "value": 5, "title": "Block media autoplay by default" }, "webgl.disabled": { "value": true, "title": "Disable WebGL (Web Graphics Library)", "requireUserOptIn": true } } } } }