User:Arroway/Secure Prefs

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Software version taken as reference:

Legend

x not modified compared to the value of the previous cell
 ? don't know if it is set and to which value
- unused
DEF default value in Firefox nightly
preference shipped in Tor, i.e. breakage is low or acceptable compared to the benefits
discrepancy in the choice of values - to be looked into
preference name ParanoidPanda lv1 ParanoidPanda lv2 ParanoidPanda lv3 Tor defaults profile Torbutton defaults Torbutton medium low Torbutton medium high Torbutton high
paranoidpanda.level 1 2 3 - - - - -
app.update.promptWaitTime  ?  ?  ? 3600 x x x x
app.update.badge  ?  ?  ? true x x x x
app.update.staging.enabled  ?  ?  ? false x x x x
beacon.disabled DEF true true DEF x x x x
beacon.enabled DEF x false DEF x x x x
browser.aboutHomeSnippets.updateUrl DEF x "" DEF x x x x
browser.cache.disk.enable DEF x false false false x x x
browser.cache.disk_cache_ssl DEF x false DEF x x x x
browser.cache.offline.enable DEF x false false x x x x
browser.casting.enabled DEF x false DEF x x x x
browser.disableResetPrompt  ?  ?  ? true x x x x
browser.display.max_font_attempts  ?  ?  ? 10 x x x x
browser.display.max_font_count  ?  ?  ? 10 x x x x
browser.display.use_document_fonts DEF x 0 DEF x x x x
browser.download.folderList DEF x 2 DEF x x x x
browser.download.forbid_open_with  ?  ?  ? false x x x x
browser.download.manager.addToRecentDocs DEF x x false DEF x x x
browser.download.manager.retention DEF x 0 1 1 x x x
browser.download.managerscanWhenDone  ?  ?  ? false x x x x
browser.download.panel.shown  ?  ?  ? true x x x x
browser.download.useDownloadDir DEF x false false x x x x
browser.eme.ui.enabled  ?  ?  ? false x x x x
browser.fixup.alternate.enabled DEF x false false x x x x
browser.formfill.enable DEF x false false x x x x
browser.formfill.expire_days DEF x 0 DEF x x x x
browser.helperApps.deleteTempFileOnExit DEF x true DEF x x x x
browser.history_expire_days DEF x 0 DEF x x x x
browser.history_expire_sites DEF x 0 DEF x x x x
browser.history_expire_visits DEF x 0 DEF x x x x
browser.link.open_newwindow.restriction  ?  ?  ? 0 x x x x
browser.newtab.preload DEF x false DEF x x x x
browser.newtab.url DEF x about:blank DEF x x x x
browser.newtabpage.directory.ping DEF x "" data:text/plain, x x x x
browser.newtabpage.directory.source DEF x data:text/plain,{} data:text/plain, x x x x
browser.newtabpage.enabled DEF x false DEF x x x x
browser.newtabpage.enhanced DEF x false false x x x x
browser.newtabpage.introShown  ?  ?  ? true x x x x
browser.newtabpage.preload  ?  ?  ? false x x x x
browser.pagethumbnails.capturing_disabled DEF x true DEF x x x x
browser.pocket.enabled DEF x false false x x x x
browser.pocket.api  ?  ?  ? "" x x x x
browser.pocket.site  ?  ?  ? "" x x x x
browser.pocket.enabled DEF x false false x x x x
browser.privatebrowsing.autostart DEF x true true x x x x
browser.reader.detectedFirstArticle  ?  ?  ? true x x x  ?
browser.rights.3.shown  ?  ?  ? true x x x x
browser.safebrowsing.downloads.remote.enabled DEF x false? DEF x x x x
browser.safebrowsing.enabled DEF x true false x x x x
browser.safebrowsing.malware.enabled DEF x true false x x x x
browser.search.countryCode  ?  ?  ? "US" x x x x
browser.search.defaultenginame  ?  ?  ? Disconnect x x x x
browser.search.geoip.url DEF x "" "" x x x x
browser.search.geoSpecificDefaults  ?  ?  ? false x x x x
browser.search.order.extra.1  ?  ?  ? Disconnect x x x x
browser.search.order.extra.2  ?  ?  ? Youtube x x x x
browser.search.region  ?  ?  ? "US" x x x x
browser.search.suggest.enabled DEF x false false x x x x
browser.search.update DEF x false false x x x x
browser.selfsupport.enabled  ?  ?  ? false x x x x
browser.selfsupport.url DEF x "" "" x x x x
browser.send_pings DEF x false false x x x x
browser.send_pings.require_same_host DEF x true DEF x x x x
browser.sessionstore.enabled DEF x false DEF x x x x
browser.sessionstore.postdata DEF x 0 DEF x x x x
browser.sessionstore.privacy_level DEF x 2 2 x x x x
browser.shell.checkDefaultBrowser DEF x x false x x x x
browser.slowStartup.notificationDisabled  ?  ?  ? true x x x x
browser.slowStartup.maxSamples  ?  ?  ? 0 x x x x
browser.slowStartup.samples  ?  ?  ? 0 x x x x
browser.startup.homepage DEF x x x chrome://torbutton/content x x x
browser.startup.homepage_override.buildID  ?  ?  ? 20100101 x x x x
browser.syncPromoViewsLeftMap  ?  ?  ? {"addons":0, "passwords":0, "bookmarks":0} x x x x
browser.uiCustomization.state  ?  ?  ? ... x x x x
browser.uitour.enabled  ?  ?  ? false x x x x
browser.urlbar.autocomplete.enabled DEF x false DEF x x x x
browser.urlbar.autoFill DEF x false DEF x x x x
browser.urlbar.autoFill.typed DEF x false DEF x x x x
browser.urlbar.filter.javascript DEF x true DEF x x x x
browser.urlbar.maxRichResults DEF x 0 DEF x x x x
browser.urlbar.suggest.searches DEF x false DEF x x x x
browser.urlbar.trimURLs DEF x false DEF x x x x
browser.usedOnWindows10  ?  ?  ? true x x true x
browser.zoom.siteSpecific  ?  ?  ? false false x x x
camera.control.face_detection.enabled DEF x false DEF x x x x
clipboard.autocopy DEF x false DEF x x x x
datareporting.healthreport.about.reportUrl  ?  ?  ? data:text/plain, x x x x
datareporting.healthreport.about.reportUrlUnified  ?  ?  ? data:text/plain, x x x x
datareporting.healthreport.service.enabled DEF x false false x x x x
datareporting.healthreport.uploadEnabled DEF x false false x x x x
datareporting.policy.dataSubmissionEnabled DEF x false false x x x x
device.sensors.enabled DEF x false false x x x x
devtools.appmanager.enabled  ?  ?  ? false x x x x
devtools.debugger.chrome-debugging-host  ?  ?  ? 127.0.0.1 x x x x
devtools.webide.autoinstallADBHelper  ?  ?  ? false x x x x
devtools.webide.autoinstallFxdtAdapters  ?  ?  ? false x x x x
devtools.webide.enabled  ?  ?  ? false x x x x
dom.battery.enabled DEF x false false false x x x
dom.enable_performance DEF x false false false x x x
dom.enable_resource_timing  ?  ?  ? false x x x x
dom.enable_user_timing  ?  ?  ? false x x x x
dom.event.clipboardevents.enabled DEF x false DEF x x x x
dom.event.highrestimestamp.enabled  ?  ?  ? true x x x x
dom.gamepad.enabled DEF x false false x x x x
dom.indexedDB.enabled  ?  ?  ? false x x x x
dom.mozTCPSocket.enabled  ?  ?  ? false x x x x
dom.network.enabled  ?  ?  ? false false x x x
dom.push.serverURL  ?  ?  ? "" x x x x
dom.quotaManager.testing  ?  ?  ?  ? true x x x
dom.telephony.enabled DEF x false DEF x x x x
dom.vr.enabled DEF x false DEF x x x x
dom.webnotifications.enabled DEF x false DEF x x x x
dom.workers.sharedWorkers.enabled  ?  ?  ? x false x x x
experiments.enabled DEF x false DEF x x x x
experiments.supported DEF x false DEF x x x x
extensions.autoDisabledScopes  ?  ?  ? 0 x x x x
extensions.blocklist.enabled DEF x true DEF x x x x
extensions.bootstrappedAddons  ?  ?  ? {} x x x x
extensions.checkCompatibility.4.*  ?  ?  ? false x x x x
extensions.databaseSchema  ?  ?  ? 3 x x x x
extensions.enabledAddons  ?  ?  ? https-everywhere,torbutton,tor-launcher x x x x
extensions.enabledItems  ?  ?  ? langpack-en-US x x x x
extensions.enabledScopes  ?  ?  ? 1 x x x x
extensions.getAddons.cache.enabled DEF x false false x x x x
extensions.ghostery.privateBrowsing DEF x true DEF x x x x
extensions.hotfix.id  ?  ?  ? "" x x x x
extensions.pendingOperations  ?  ?  ? false x x x x
extensions.ui.lastCategory  ?  ?  ? adons://list/extension x x x x
extensions.update.enabled DEF x true DEF x x x x
general.appname.override  ?  ?  ? Netscape x x x x
general.appversion.override  ?  ?  ? 5.0 (Windows) x x x x
general.buildID.override DEF x 20100101 20100101 x x x x
general.oscpu.override  ?  ?  ? Windows NT 6.1 x x x x
general.platform.override  ?  ?  ? Win32 x x x x
general.productSub.override  ?  ?  ? 20100101 x x x x
general.useragent.override  ?  ?  ? Mozilla/5.0 (Windows NT... x x x x
general.useragent.vendor  ?  ?  ? "" x x x x
general.useragent.vendoSub  ?  ?  ? "" x x x x
geo.disabled DEF x true DEF x x x x
geo.enabled DEF x false false x x x x
geo.wifi.uri  ?  ?  ? "" x x x x
gfx.direct2d.disabled DEF x true true x x x x
gfx.downloadable_fonts.fallback_delay  ?  ?  ? -1 x x x x
gfx.font_rendering.opentype_svg.enabled DEF x false DEF x x false x
gfx.xrender.enabled  ?  ?  ? false x x x x
intl.accept_languages  ?  ?  ? x en-US, en x x x
intl.charset.default  ?  ?  ? windows-1252 x x x x
javascript.options.asmjs DEF x false false x x x x
javascript.options.baselinejit.content DEF x x x x x false x
javascript.options.ion.content DEF x x x x false x x
javascript.options.methodjit.chrome DEF x false DEF x x x x
javascript.options.methodjit.content DEF x false DEF x x x x
javascript.options.typeinference DEF x x x x false x x
javascript.use_us_english_locale  ?  ?  ? true x x x x
keyword.enabled DEF x x x x x x x
layers.acceleration.disabled DEF x true true x x x x
layout.css.visited_links_enabled DEF x false DEF x x x x
loop.logDomains DEF x false DEF x x x x
mathml.disabled  ?  ?  ? false x true x x
media.auto_data.enabled  ?  ?  ? false x x x x
media.cache_size  ?  ?  ? 0 x x x x
media.eme.apiVisible  ?  ?  ? false x x x x
media.eme.enabled  ?  ?  ? false x x x x
media.getusermedia.screensharing.enabled DEF x false DEF x x x x
media.gmp-eme-adobe.enabled  ?  ?  ? false x x x x
media.gmp-gmpopenh264.enabled DEF x false DEF x x x x
media.gmp-manager.url DEF x "" DEF x x x x
media.gmp-manager.url.override  ?  ?  ? data:text/plain, x x x x
media.gmp-provider.enabled  ?  ?  ? false x x x x
media.navigator.enabled DEF x false false x x x x
media.peerconnection.enabled DEF false false false x x x x
media.peerconnection.ice.relay_only DEF true true DEF x x x x
media.video_stats.enabled DEF x false false x x x x
media.webaudio.enabled  ?  ?  ? DEF x false x x
media.webspeech.recognition.enable DEF x false DEF x x x x
network.cookie.cookieBehavior DEF 3 1 1 1 x x x
network.cookie.life DEF x 2 DEF x x x x
network.cookie.lifetimePolicy DEF 2 2 2 2 x x x
network.cookie.thirdparty.sessionOnly DEF x true DEF x x x x
network.dns.blockDotOnion DEF x true DEF x x x x
network.dns.disablePrefetch DEF true true true x x x x
network.dns.disablePrefetchFromHTTPS DEF x true DEF x x x x
network.http.altsvc.enabled  ?  ?  ? false x x x x
network.http.altsvc.oe  ?  ?  ? false x x x x
network.http.connection-retry-timeout  ?  ?  ? 0 x x x x
network.http.max-persistent-connections-per-proxy  ?  ?  ? 256 x x x x
network.http.pipelining  ?  ?  ? true x x x x
network.http.pipelining.aggressive  ?  ?  ? true x x x x
network.http.pipelining.max-optimistic-requests  ?  ?  ? 3 x x x x
network.http.pipelining.maxrequests  ?  ?  ? 12 x x x x
network.http.pipelining.reschedule-timeout  ?  ?  ? 15000 x x x x
network.http.pipelining.read-timeout  ?  ?  ? 60000 x x x x
network.http.pipelining.ssl  ?  ?  ? true x x x x
network.http.proxy.pipelining  ?  ?  ? true x x x x
network.http.referer.sendRefererHeader DEF x 0 DEF x x x x
network.http.referer.spoofSource DEF x true DEF x x x x
network.http.referer.trimmingPolicy DEF x 2 DEF x x x x
network.http.sendSecureXSiteReferrer DEF x false DEF x x x x
network.http.spdy.enabled.http2  ?  ?  ? false x x x x
network.http.spdy.enabled.http2draft  ?  ?  ? false x x x x
network.http.spdy.enabled  ?  ?  ? false x x x x
network.http.spdy.enabled.v2  ?  ?  ? false x x x x
network.http.spdy.enabled.v3  ?  ?  ? false x x x x
network.http.spdy.enabled.v3-1  ?  ?  ? false x x x x
network.http.speculative-parallel-limit DEFL x 0 DEF x x x x
network.IDN_show_punycode DEF x true DEF x x x x
network.jar.block-remote-files  ?  ?  ? false x true x x
network.jar.open-unsafe-types DEF x false DEF x x x x
network.manage-offline-status  ?  ?  ? false x x x x
network.negotiate-auth.allow-insecure-ntlm-v1 DEF x false DEF x x x x
network.predictor.enabled DEF x false false x x x x
network.prefetch-next DEF x false DEF x x x x
network.protocole-handler.external-default  ?  ?  ? false x x x x
network.protocole-handler.external.mailto  ?  ?  ? false x x x x
network.protocole-handler.external.news  ?  ?  ? false x x x x
network.protocole-handler.external.nntp  ?  ?  ? false x x x x
network.protocole-handler.external.snews  ?  ?  ? false x x x x
network.protocole-handler.warn-external.mailto  ?  ?  ? true x x x x
network.protocole-handler.warn-external.news  ?  ?  ? true x x x x
network.protocole-handler.warn-external.nntp  ?  ?  ? true x x x x
network.protocole-handler.warn-external.snews  ?  ?  ? true x x x x
network.proxy.no_proxies_on  ?  ?  ? "" x x x x
network.proxy.socks  ?  ?  ? 127.0.0.1 x x x x
network.proxy.socks_port  ?  ?  ? 9150 x x x x
network.proxy.socks_remote_dns DEF x true true x x x x
network.proxy.type  ?  ?  ? 1 x x x x
network.security.ports.banned  ?  ?  ? 9050,9051,9150,9151 x x x x
network.seer.enabled DEF x false DEF x x x x
network.stricttransportsecurity.preloadlist DEF x true DEF x x x x
noscript.forbidMedia  ?  ?  ? DEF x x x true
noscript.forbidMedia  ?  ?  ? DEF x true x x
noscript.global  ?  ?  ? DEF x x false false
noscript.globalHttpsWhitelist  ?  ?  ? DEF x x true false
pdfjs.disabled DEF x true DEF x x x x
permissions.memory_only false x true true true x x x
places.history.enabled DEF x false DEF false x x x
plugins.click_to_play DEF x true true x x x x
plugins.disable  ?  ?  ? true x x x x
plugins.expose_full_path  ?  ?  ? false false x x x
plugins.hide_infobar_for_missing_plugin  ?  ?  ? true x x x x
plugins.hide_infobar_for_outdated_plugin DEF x false DEF x x x x
plugins.hideMissingPluginsNotification  ?  ?  ? true x x x x
plugin.state.flash DEF x 0 1 x x x x
plugin.state.libgnome-shell-browser-plugin DEF x 0 DEF x x x x
plugins.update.notifyUser DEF x true DEF x x x x
privacy.clearOnShutdown.cache DEF x true DEF x x x x
privacy.clearOnShutdown.cookies DEF x true DEF x x x x
privacy.clearOnShutdown.downloads DEF x true DEF x x x x
privacy.clearOnShutdown.formdata DEF x true DEF x x x x
privacy.clearOnShutdown.history DEF x true DEF x x x x
privacy.clearOnShutdown.offlineApps DEF x true DEF x x x x
privacy.clearOnShutdown.openWindows DEF x true DEF x x x x
privacy.clearOnShutdown.passwords DEF x true DEF x x x x
privacy.clearOnShutdown.sessions DEF x true DEF x x x x
privacy.clearOnShutdown.siteSettings DEF x true DEF x x x x
privacy.donottrackheader.enabled DEF true true DEF x x x x
privacy.donottrackheader.value DEF 1 1 DEF x x x x
privacy.resistFingerprinting  ?  ?  ? true true x x x
privacy.sanitize.sanitizeOnShutdown DEF x true DEF x x x x
privacy.suppressModifierKeyEvents  ?  ?  ? true x x x x
privacy.thirdparty.isolate  ?  ?  ? 2 2 x x x
privacy.trackingprotection.pbmode.enabled DEF x true false x x x x
privacy.trackingprotection.ui.enabled DEF x true DEF x x x x
privacy.trackingprotection.enabled DEF true true DEF x x x x
reader.parse-on-load.enabled  ?  ?  ? false x x x x
security.ask_for_password DEF x 0 x x x x x
security.csp.experimentalEnabled DEF x true DEF x x x x
security.csp.enable DEF x x x x x x x
security.cert_pinning.enforcement_level DEF x 2 2 x x x x
security.enable_tls_session_tickets DEF x false false false x x x
security.fileuri.strict_origin_policy DEF x true DEF x x x x
security.mixed_content.block_display_content DEF true true DEF x x x x
security.mixed_content.block_active_content DEF x true false x x x x
security.nocertdb false false true true true x x x
security.OCSP.enabled DEF x 1 DEF x x x x
security.OCSP.require DEF x true DEF x x x x
security.pki.sha1_enforcement_level DEFL x 2 2 x x x x
security.sri.enable DEF x x x x x x x
security.ssl.disable_session_identifiers  ?  ?  ? true x x x x
security.ssl.enable_ocsp_stapling DEF x true DEF x x x x
security.ssl.enable_false_start  ?  ?  ? true x x x x
security.ssl.errorReporting.automatic DEF x false DEF x x x x
security.ssl.require_safe_negotiation DEF x true DEF x x x x
security.ssl.treat_unsafe_negotiation_as_broke DEF true true DEF x x x x
security.ssl.warn_missing_rfc5746 DEF x 1 DEF x x x x
security.ssl3.rsa_null_sha DEF x false DEF x x x x
security.ssl3.rsa_null_md5 DEF x false DEF x x x x
security.ssl3.ecdhe_rsa_null_sha DEF x false DEF x x x x
security.ssl3.ecdhe_ecdsa_null_sha DEF x false DEF x x x x
security.ssl3.ecdh_rsa_null_sha DEF x false DEF x x x x
security.ssl3.ecdh_ecdsa_null_sha DEF x false DEF x x x x
security.ssl3.rsa_seed_sha DEF x false DEF x x x x
security.ssl3.rsa_rc4_40_md5 DEF x false DEF x x x x
security.ssl3.rsa_rc2_40_md5 DEF x false DEF x x x x
security.ssl3.rsa_1024_rc4_56_sha DEF x false DEF x x x x
security.ssl3.rsa_camellia_128_sha DEF x false DEF x x x x
security.ssl3.ecdhe_rsa_aes_128_sha DEF x false DEF x x x x
security.ssl3.ecdhe_ecdsa_aes_128_sha DEF x false DEF x x x x
security.ssl3.ecdh_rsa_aes_128_sha DEF x false DEF x x x x
security.ssl3.ecdh_ecdsa_aes_128_sha DEF x false DEF x x x x
security.ssl3.dhe_rsa_camellia_128_sha DEF x false DEF x x x x
security.ssl3.dhe_rsa_aes_128_sha DEFL x false DEF x x x x
security.ssl3.ecdh_ecdsa_rc4_128_sha DEF x false DEF x x x x
security.ssl3.ecdh_rsa_rc4_128_sha DEF x false DEF x x x x
security.ssl3.ecdhe_ecdsa_rc4_128_sha DEF x false DEF x x x x
security.ssl3.ecdhe_rsa_rc4_128_sha DEF x false DEF x x x x
security.ssl3.rsa_rc4_128_md5 DEF x false DEF x x x x
security.ssl3.rsa_rc4_128_sha DEF x false DEF x x x x
security.ssl3.dhe_dss_des_ede3_sha DEF x false DEF x x x x
security.ssl3.dhe_rsa_des_ede3_sha DEF x false DEF x x x x
security.ssl3.ecdh_ecdsa_des_ede3_sha DEF x false DEF x x x x
security.ssl3.ecdh_rsa_des_ede3_sha DEF x false DEF x x x x
security.ssl3.ecdhe_ecdsa_des_ede3_sha DEF x false DEF x x x x
security.ssl3.ecdhe_rsa_des_ede3_sha DEF x false DEF x x x x
security.ssl3.rsa_des_ede3_sha DEF x false DEF x x x x
security.ssl3.rsa_fips_des_ede3_sha DEF x false DEF x x x x
security.ssl3.ecdh_rsa_aes_256_sha DEF x false DEF x x x x
security.ssl3.ecdh_ecdsa_aes_256_sha DEF x false DEF x x x x
security.ssl3.rsa_camellia_256_sha DEF x false DEF x x x x
security.ssl3.ecdhe_rsa_aes_256_sha DEF x true DEF x x x x
security.ssl3.ecdhe_ecdsa_aes_256_sha DEF x true DEF x x x x
security.ssl3.ecdhe_ecdsa_aes_128_gcm_sha256 DEF x true DEF x x x x
security.ssl3.ecdhe_rsa_aes_128_gcm_sha256 DEF x true DEF x x x x
security.ssl3.dhe_rsa_camellia_256_sha DEF x false DEF x x x x
security.ssl3.dhe_rsa_aes_256_sha DEF x false DEF x x x x
security.ssl3.dhe_dss_aes_128_sha DEF x false DEF x x x x
security.ssl3.dhe_dss_aes_256_sha DEF x false DEF x x x x
security.ssl3.dhe_dss_camellia_128_sha DEF x false DEF x x x x
security.ssl3.dhe_dss_camellia_256_sha DEFL x false DEF x x x x
security.ssl3.rsa_aes_256_sha DEF x true DEF x x x x
security.ssl3.rsa_aes_128_sha DEF x true DEF x x x x
security.tls.unrestricted_rc4_fallback false x x false x x x x
security.tls.version.max  ?  ?  ? 3 x x x x
security.tls.version.min DEF 2 3 DEF x x x x
security.warn_entering_weak DEF x true DEF x x x x
security.xpconnect.plugin.unrestricted DEF x false DEF x x x x
services.sync.engine.prefs  ?  ?  ? false x x x x
services.sync.engine.addons  ?  ?  ? false x x x x
services.sync.engine.tabs  ?  ?  ? false x x x x
services.sync.ui.hidden  ?  ?  ? true x x x x
signon.autofillForms DEF false false DEF x x x x
signon.rememberSignons DEF x false DEF x x x x
startup.homepage_override_url  ?  ?  ? https://blog.torproject.org/... x x x x
startup.homepage_welcome_url  ?  ?  ? "" x x x x
startup.homepage_welcome_url.additional  ?  ?  ? "" x x x x
svg.in-content.enabled  ?  ?  ? true x x x false
ui.use_standins_for_native_colors  ?  ?  ? true x x x x
toolkit.telemetry.enabled DEF x false DEF x x x x
toolkit.telemetry.unified DEF x false false x x x x
torbrowser.version - - - VERSION x x x x
urlclassifier.trackingWhitelistTable DEF x test-trackwhite-simple DEF x x x x
webgl.disabled DEF true true DEF x x x x
webgl.min_capability_mode  ?  ?  ? true true x x x
webgl.disable-extensions  ?  ?  ? true true x x x
webgl.disable-fail-if-major-performance-caveat  ?  ?  ? true x x x x
xpinstall.whitelist.add  ?  ?  ? "" x x x x
xpinstall.whitelist.add.36  ?  ?  ? "" x x x x


In the Tor borwser: font related prefs are also set. See: https://gitweb.torproject.org/tor-browser.git/plain/browser/app/profile/000-tor-browser.js?h=tor-browser-45.2.0esr-6.5-1