Nota: Para añadir o eliminar preferencias es necesario que el navegador se encuentre cerrado, la ruta para encontrar o crear el archivo es /home/usuario/.mozilla/firefox/perfil.default/, se abre o crea un archivo llamado prefs.js y otra opción es editarlo desde el navegador accediendo a about:config y añadiendo las preferencias manualmente..

// Mozilla User Preferences

// DO NOT EDIT THIS FILE.
//
// If you make changes to this file while the application is running,
// the changes will be overwritten when the application exits.
//
// To change a preference value, you can either:
// - modify it via the UI (e.g. via about:config in the browser); or
// - set it within a user.js file in your profile.

user_pref("accessibility.typeaheadfind.flashBar", 0);
user_pref("app.normandy.api_url", "");
user_pref("app.normandy.enabled", false);
user_pref("app.normandy.first_run", false);
user_pref("app.normandy.user_id", "4a857b83-a49e-42e3-85d7-81de82288d1d");
user_pref("app.shield.optoutstudies.enabled", false);
user_pref("app.update.lastUpdateTime.addon-background-update-timer", 1560090058);
user_pref("app.update.lastUpdateTime.blocklist-background-update-timer", 1560136359);
user_pref("app.update.lastUpdateTime.browser-cleanup-thumbnails", 1560171786);
user_pref("app.update.lastUpdateTime.recipe-client-addon-run", 1559243951);
user_pref("app.update.lastUpdateTime.search-engine-update-timer", 1560171666);
user_pref("app.update.lastUpdateTime.services-settings-poll-changes", 1560089938);
user_pref("app.update.lastUpdateTime.telemetry_modules_ping", 1559244551);
user_pref("app.update.lastUpdateTime.xpi-signature-verification", 1560136479);
user_pref("beacon.enabled", false);
user_pref("breakpad.reportURL", "");
user_pref("browser.aboutHomeSnippets.updateUrl", "");
user_pref("browser.bookmarks.restore_default_bookmarks", false);
user_pref("browser.cache.disk.capacity", 153600);
user_pref("browser.cache.disk.filesystem_reported", 1);
user_pref("browser.cache.disk.smart_size.first_run", false);
user_pref("browser.chrome.site_icons", false);
user_pref("browser.contentblocking.category", "standard");
user_pref("browser.contentblocking.introCount", 20);
user_pref("browser.discovery.enabled", false);
user_pref("browser.download.animateNotifications", false);
user_pref("browser.download.panel.shown", true);
user_pref("browser.download.save_converter_index", 0);
user_pref("browser.formfill.enable", false);
user_pref("browser.laterrun.bookkeeping.profileCreationTime", 1559243684);
user_pref("browser.laterrun.bookkeeping.sessionCount", 51);
user_pref("browser.library.activity-stream.enabled", false);
user_pref("browser.migration.version", 80);
user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", false);
user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features", false);
user_pref("browser.newtabpage.activity-stream.feeds.favicon", false);
user_pref("browser.newtabpage.activity-stream.feeds.section.highlights", false);
user_pref("browser.newtabpage.activity-stream.feeds.snippets", false);
user_pref("browser.newtabpage.activity-stream.feeds.topsites", false);
user_pref("browser.newtabpage.activity-stream.impressionId", "{edaf5e3d-38c0-4a84-b619-e579f4103387}");
user_pref("browser.newtabpage.activity-stream.migrationLastShownDate", 1559192400);
user_pref("browser.newtabpage.activity-stream.migrationRemainingDays", 3);
user_pref("browser.newtabpage.activity-stream.prerender", false);
user_pref("browser.newtabpage.activity-stream.section.highlights.includeBookmarks", false);
user_pref("browser.newtabpage.activity-stream.section.highlights.includeDownloads", false);
user_pref("browser.newtabpage.activity-stream.section.highlights.includePocket", false);
user_pref("browser.newtabpage.activity-stream.section.highlights.includeVisited", false);
user_pref("browser.newtabpage.activity-stream.showSearch", false);
user_pref("browser.newtabpage.enabled", false);
user_pref("browser.newtabpage.storageVersion", 1);
user_pref("browser.pageActions.persistedActions", "{\"version\":1,\"ids\":[\"bookmark\",\"bookmarkSeparator\",\"copyURL\",\"emailLink\",\"addSearchEngine\",\"sendToDevice\",\"pinTab\"],\"idsInUrlbar\":[\"bookmark\"]}");
user_pref("browser.pagethumbnails.storage_version", 3);
user_pref("browser.ping-centre.telemetry", false);
user_pref("browser.preferences.defaultPerformanceSettings.enabled", false);
user_pref("browser.rights.3.shown", true);
user_pref("browser.safebrowsing.allowOverride", false);
user_pref("browser.safebrowsing.blockedURIs.enabled", false);
user_pref("browser.safebrowsing.downloads.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.block_potentially_unwanted", false);
user_pref("browser.safebrowsing.downloads.remote.block_uncommon", false);
user_pref("browser.safebrowsing.downloads.remote.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.url", "");
user_pref("browser.safebrowsing.malware.enabled", false);
user_pref("browser.safebrowsing.phishing.enabled", false);
user_pref("browser.safebrowsing.provider.google.gethashURL", "");
user_pref("browser.safebrowsing.provider.google.reportMalwareMistakeURL", "");
user_pref("browser.safebrowsing.provider.google.reportPhishMistakeURL", "");
user_pref("browser.safebrowsing.provider.google.reportURL", "");
user_pref("browser.safebrowsing.provider.google.updateURL", "");
user_pref("browser.safebrowsing.provider.google4.dataSharing.enabled", true);
user_pref("browser.safebrowsing.provider.google4.dataSharingURL", "");
user_pref("browser.safebrowsing.provider.google4.gethashURL", "");
user_pref("browser.safebrowsing.provider.google4.lastupdatetime", "1559692503976");
user_pref("browser.safebrowsing.provider.google4.nextupdatetime", "1559694325976");
user_pref("browser.safebrowsing.provider.google4.reportMalwareMistakeURL", "");
user_pref("browser.safebrowsing.provider.google4.reportPhishMistakeURL", "");
user_pref("browser.safebrowsing.provider.google4.updateURL", "");
user_pref("browser.safebrowsing.provider.mozilla.gethashURL", "");
user_pref("browser.safebrowsing.provider.mozilla.lastupdatetime", "1559739264496");
user_pref("browser.safebrowsing.provider.mozilla.nextupdatetime", "1559742864496");
user_pref("browser.safebrowsing.provider.mozilla.updateURL", "");
user_pref("browser.safebrowsing.reportPhishURL", "");
user_pref("browser.search.geoip.url", "");
user_pref("browser.search.region", "MX");
user_pref("browser.search.suggest.enabled", false);
user_pref("browser.send_pings.require_same_host", true);
user_pref("browser.shell.mostRecentDateSetAsDefault", "1560173569");
user_pref("browser.shell.shortcutFavicons", false);
user_pref("browser.slowStartup.averageTime", 7637);
user_pref("browser.slowStartup.samples", 3);
user_pref("browser.startup.homepage", "about:blank");
user_pref("browser.startup.homepage_override.buildID", "20190529211957");
user_pref("browser.startup.homepage_override.mstone", "67.0.1");
user_pref("browser.tabs.crashReporting.sendReport", false);
user_pref("browser.tabs.drawInTitlebar", false);
user_pref("browser.tabs.showAudioPlayingIcon", false);
user_pref("browser.uiCustomization.state", "{\"placements\":{\"widget-overflow-fixed-list\":[],\"nav-bar\":[\"back-button\",\"forward-button\",\"history-panelmenu\",\"urlbar-container\",\"downloads-button\",\"umatrix_raymondhill_net-browser-action\"],\"toolbar-menubar\":[\"menubar-items\"],\"TabsToolbar\":[\"tabbrowser-tabs\",\"new-tab-button\",\"alltabs-button\"],\"PersonalToolbar\":[\"personal-bookmarks\"]},\"seen\":[\"developer-button\",\"umatrix_raymondhill_net-browser-action\",\"webide-button\"],\"dirtyAreaCache\":[\"nav-bar\",\"toolbar-menubar\",\"TabsToolbar\",\"PersonalToolbar\"],\"currentVersion\":16,\"newElementCount\":6}");
user_pref("browser.uidensity", 1);
user_pref("browser.uitour.enabled", false);
user_pref("browser.uitour.url", "");
user_pref("browser.urlbar.autoFill", false);
user_pref("browser.urlbar.maxCharsForSearchSuggestions", 0);
user_pref("browser.urlbar.maxRichResults", 0);
user_pref("browser.urlbar.placeholderName", "DuckDuckGo");
user_pref("browser.urlbar.searchSuggestionsChoice", false);
user_pref("browser.urlbar.speculativeConnect.enabled", false);
user_pref("browser.urlbar.suggest.bookmark", false);
user_pref("browser.urlbar.suggest.history", false);
user_pref("browser.urlbar.suggest.openpage", false);
user_pref("browser.urlbar.suggest.searches", false);
user_pref("browser.urlbar.timesBeforeHidingSuggestionsHint", 0);
user_pref("browser.urlbar.userMadeSearchSuggestionsChoice", true);
user_pref("captivedetect.canonicalURL", "");
user_pref("datareporting.healthreport.uploadEnabled", false);
user_pref("datareporting.policy.dataSubmissionEnabled", false);
user_pref("datareporting.policy.dataSubmissionPolicyAcceptedVersion", 2);
user_pref("datareporting.policy.dataSubmissionPolicyNotifiedTime", "1559246511289");
user_pref("devtools.debugger.prefs-schema-version", "1.0.9");
user_pref("devtools.onboarding.telemetry.logged", true);
user_pref("devtools.toolbox.selectedTool", "memory");
user_pref("devtools.toolsidebar-height.inspector", 350);
user_pref("devtools.toolsidebar-width.inspector", 700);
user_pref("devtools.toolsidebar-width.inspector.splitsidebar", 350);
user_pref("distribution.canonical.bookmarksProcessed", true);
user_pref("distribution.iniFile.exists.appversion", "67.0.1");
user_pref("distribution.iniFile.exists.value", true);
user_pref("dom.battery.enabled", false);
user_pref("dom.event.clipboardevents.enabled", false);
user_pref("dom.event.contextmenu.enabled", false);
user_pref("dom.ipc.plugins.flash.subprocess.crashreporter.enabled", false);
user_pref("dom.ipc.plugins.reportCrashURL", false);
user_pref("dom.push.connection.enabled", false);
user_pref("dom.push.enabled", false);
user_pref("dom.push.serverURL", "");
user_pref("extensions.blocklist.enabled", false);
user_pref("extensions.blocklist.lastModified", "Mon, 03 Jun 2019 12:07:27 GMT");
user_pref("extensions.blocklist.pingCountTotal", 5);
user_pref("extensions.blocklist.pingCountVersion", -1);
user_pref("extensions.blocklist.url", "");
user_pref("extensions.databaseSchema", 31);
user_pref("extensions.formautofill.addresses.enabled", false);
user_pref("extensions.formautofill.available", "off");
user_pref("extensions.formautofill.creditCards.enabled", false);
user_pref("extensions.formautofill.heuristics.enabled", false);
user_pref("extensions.getAddons.cache.lastUpdate", 1560090102);
user_pref("extensions.getAddons.databaseSchema", 5);
user_pref("extensions.incognito.migrated", true);
user_pref("extensions.lastAppBuildId", "20190529211957");
user_pref("extensions.lastAppVersion", "67.0.1");
user_pref("extensions.lastPlatformVersion", "67.0.1");
user_pref("extensions.pendingOperations", false);
user_pref("extensions.pocket.api", "");
user_pref("extensions.pocket.enabled", false);
user_pref("extensions.pocket.oAuthConsumerKey", "");
user_pref("extensions.pocket.site", "");
user_pref("extensions.privatebrowsing.notification", true);
user_pref("extensions.screenshots.disabled", true);
user_pref("extensions.screenshots.upload-disabled", true);
user_pref("extensions.systemAddonSet", "{\"schema\":1,\"addons\":{}}");
user_pref("extensions.ui.dictionary.hidden", true);
user_pref("extensions.ui.lastCategory", "addons://list/extension");
user_pref("extensions.ui.locale.hidden", false);
user_pref("extensions.webcompat.perform_injections", true);
user_pref("extensions.webcompat.perform_ua_overrides", true);
user_pref("extensions.webextensions.ExtensionStorageIDB.migrated.screenshots@mozilla.org", true);
user_pref("extensions.webextensions.ExtensionStorageIDB.migrated.uMatrix@raymondhill.net", true);
user_pref("extensions.webextensions.uuids", "{\"formautofill@mozilla.org\":\"dc9d5300-5a33-4f15-84b7-3cf945392994\",\"screenshots@mozilla.org\":\"f8a5270d-5690-471c-9c23-66e9afcd4f62\",\"webcompat-reporter@mozilla.org\":\"56482814-7c70-4a36-b6b5-2142a068a9b2\",\"webcompat@mozilla.org\":\"72da9ce6-8099-49b5-a0a2-03e6fc524fac\",\"baidu-code-update@mozillaonline.com\":\"fa31497d-2a4b-4fc8-87af-f7e5ccc6ede3\",\"fxmonitor@mozilla.org\":\"59837a1e-46a1-400f-a9e1-499f64ededb7\",\"uMatrix@raymondhill.net\":\"9cace6d4-f25c-417e-ae2d-9c81a57069f0\"}");
user_pref("font.internaluseonly.changed", true);
user_pref("general.warnOnAboutConfig", false);
user_pref("geo.enabled", false);
user_pref("geo.wifi.uri", "");
user_pref("gfx.blacklist.canvas2d.acceleration", 4);
user_pref("gfx.blacklist.canvas2d.acceleration.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.d3d11.keyed.mutex", 4);
user_pref("gfx.blacklist.d3d11.keyed.mutex.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.direct2d", 4);
user_pref("gfx.blacklist.direct2d.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.direct3d11angle", 4);
user_pref("gfx.blacklist.direct3d11angle.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.dx.interop2", 4);
user_pref("gfx.blacklist.dx.interop2.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.dx.nv12", 4);
user_pref("gfx.blacklist.dx.nv12.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.dx.p010", 4);
user_pref("gfx.blacklist.dx.p010.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.dx.p016", 4);
user_pref("gfx.blacklist.dx.p016.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.gpu.process", 4);
user_pref("gfx.blacklist.gpu.process.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.hardwarevideodecoding", 4);
user_pref("gfx.blacklist.hardwarevideodecoding.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.layers.advanced", 4);
user_pref("gfx.blacklist.layers.advanced.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.layers.direct3d10", 4);
user_pref("gfx.blacklist.layers.direct3d10-1", 4);
user_pref("gfx.blacklist.layers.direct3d10-1.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.layers.direct3d10.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.layers.direct3d11", 4);
user_pref("gfx.blacklist.layers.direct3d11.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.layers.direct3d9", 4);
user_pref("gfx.blacklist.layers.direct3d9.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.layers.opengl", 4);
user_pref("gfx.blacklist.layers.opengl.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.stagefright", 4);
user_pref("gfx.blacklist.stagefright.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.webgl.angle", 4);
user_pref("gfx.blacklist.webgl.angle.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.webgl.msaa", 4);
user_pref("gfx.blacklist.webgl.msaa.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.webgl.opengl", 4);
user_pref("gfx.blacklist.webgl.opengl.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.webgl2", 4);
user_pref("gfx.blacklist.webgl2.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.webrender", 4);
user_pref("gfx.blacklist.webrender.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.webrtc.hw.acceleration", 4);
user_pref("gfx.blacklist.webrtc.hw.acceleration.decode", 4);
user_pref("gfx.blacklist.webrtc.hw.acceleration.decode.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.webrtc.hw.acceleration.encode", 4);
user_pref("gfx.blacklist.webrtc.hw.acceleration.encode.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("gfx.blacklist.webrtc.hw.acceleration.failureid", "FEATURE_FAILURE_OPENGL_1");
user_pref("idle.lastDailyNotification", 1560049807);
user_pref("javascript.enabled", false);
user_pref("layers.acceleration.disabled", true);
user_pref("layout.spellcheckDefault", 0);
user_pref("lightweightThemes.usedThemes", "[]");
user_pref("media.benchmark.vp9.fps", 6);
user_pref("media.benchmark.vp9.versioncheck", 5);
user_pref("media.gmp-gmpopenh264.abi", "x86-gcc3");
user_pref("media.gmp-gmpopenh264.lastUpdate", 1559246816);
user_pref("media.gmp-gmpopenh264.version", "1.8.1");
user_pref("media.gmp-manager.buildID", "20190529211957");
user_pref("media.gmp-manager.lastCheck", 1560136963);
user_pref("media.gmp.storage.version.observed", 1);
user_pref("media.navigator.enabled", false);
user_pref("network.captive-portal-service.enabled", false);
user_pref("network.cookie.lifetimePolicy", 2);
user_pref("network.dns.disableIPv6", true);
user_pref("network.dns.disablePrefetch", true);
user_pref("network.http.speculative-parallel-limit", 0);
user_pref("network.predictor.cleaned-up", true);
user_pref("network.predictor.enabled", false);
user_pref("network.prefetch-next", false);
user_pref("network.trr.uri", "");
user_pref("pdfjs.enabledCache.state", false);
user_pref("pdfjs.migrationVersion", 2);
user_pref("pdfjs.previousHandler.alwaysAskBeforeHandling", true);
user_pref("pdfjs.previousHandler.preferredAction", 4);
user_pref("permissions.default.camera", 2);
user_pref("permissions.default.desktop-notification", 2);
user_pref("permissions.default.geo", 2);
user_pref("permissions.default.microphone", 2);
user_pref("permissions.manager.defaultsUrl", "");
user_pref("places.database.lastMaintenance", 1559938465);
user_pref("places.history.enabled", false);
user_pref("places.history.expiration.transient_current_max_pages", 112348);
user_pref("plugin.disable_full_page_plugin_for_types", "application/pdf");
user_pref("pref.downloads.disable_button.edit_actions", false);
user_pref("pref.general.disable_button.default_browser", false);
user_pref("privacy.clearOnShutdown.offlineApps", true);
user_pref("privacy.clearOnShutdown.siteSettings", true);
user_pref("privacy.cpd.offlineApps", true);
user_pref("privacy.cpd.siteSettings", true);
user_pref("privacy.firstparty.isolate", true);
user_pref("privacy.history.custom", true);
user_pref("privacy.resistFingerprinting", true);
user_pref("privacy.sanitize.pending", "[{\"id\":\"shutdown\",\"itemsToClear\":[\"cache\",\"cookies\",\"offlineApps\",\"history\",\"formdata\",\"downloads\",\"sessions\",\"siteSettings\"],\"options\":{}},{\"id\":\"newtab-container\",\"itemsToClear\":[],\"options\":{}}]");
user_pref("privacy.sanitize.sanitizeOnShutdown", true);
user_pref("privacy.sanitize.timeSpan", 0);
user_pref("security.remote_settings.intermediates.checked", 1560090061);
user_pref("security.sandbox.content.tempDirSuffix", "1aee5534-ec4e-4474-b1ed-8373159be993");
user_pref("security.sandbox.plugin.tempDirSuffix", "aeb9e1f3-cff4-4ac6-bc4f-b07c7e18edae");
user_pref("security.ssl.errorReporting.enabled", false);
user_pref("security.ssl.errorReporting.url", "");
user_pref("services.blocklist.addons.checked", 1559740958);
user_pref("services.blocklist.addons.collection", "");
user_pref("services.blocklist.gfx.checked", 1560090061);
user_pref("services.blocklist.onecrl.checked", 1560090061);
user_pref("services.blocklist.pinning.checked", 1560090061);
user_pref("services.blocklist.plugins.checked", 1560090061);
user_pref("services.settings.clock_skew_seconds", -119);
user_pref("services.settings.last_update_seconds", 1560090061);
user_pref("services.settings.main.hijack-blocklists.last_check", 1560090061);
user_pref("services.settings.main.language-dictionaries.last_check", 1560090061);
user_pref("services.settings.main.onboarding.last_check", 1560090061);
user_pref("services.settings.main.sites-classification.last_check", 1560090061);
user_pref("services.settings.main.tippytop.last_check", 1560090061);
user_pref("services.settings.main.url-classifier-skip-urls.last_check", 1560090061);
user_pref("services.sync.clients.lastSync", "0");
user_pref("services.sync.declinedEngines", "");
user_pref("services.sync.globalScore", 0);
user_pref("services.sync.nextSync", 0);
user_pref("services.sync.prefs.sync.browser.crashReports.unsubmittedCheck.autoSubmit2", false);
user_pref("services.sync.tabs.lastSync", "0");
user_pref("signon.importedFromSqlite", true);
user_pref("signon.rememberSignons", false);
user_pref("startup.homepage_welcome_url", "");
user_pref("storage.vacuum.last.index", 1);
user_pref("storage.vacuum.last.places.sqlite", 1559244113);
user_pref("toolkit.cosmeticAnimations.enabled", false);
user_pref("toolkit.startup.last_success", 1560173561);
user_pref("toolkit.telemetry.archive.enabled", false);
user_pref("toolkit.telemetry.bhrPing.enabled", false);
user_pref("toolkit.telemetry.cachedClientID", "c0ffeec0-ffee-c0ff-eec0-ffeec0ffeec0");
user_pref("toolkit.telemetry.firstShutdownPing.enabled", false);
user_pref("toolkit.telemetry.hybridContent.enabled", false);
user_pref("toolkit.telemetry.newProfilePing.enabled", false);
user_pref("toolkit.telemetry.previousBuildID", "20190517141342");
user_pref("toolkit.telemetry.reportingpolicy.firstRun", false);
user_pref("toolkit.telemetry.server", "");
user_pref("toolkit.telemetry.shutdownPingSender.enabled", false);
user_pref("toolkit.telemetry.unified", false);
user_pref("toolkit.telemetry.updatePing.enabled", false);
user_pref("urlclassifier.malwareTable", "goog-malware-proto,test-harmful-simple,test-malware-simple");