Another way to make mass changes to settings is to use a user.js file in your profile directory.
If you search for "Firefox user.js" you will find several articles and web sites about it.
Here is mine for example. It contains some things that normal people might not want disabled or changed.
// (two forward slashes) comments out the line or everything after // to the end of the line.
I don't think you can modify or replace user.js while Firefox is running. Some of the articles say that after changes to user.js you should delete the ~/.cache/mozilla folder before starting Firefox.
Code: Select all
//## Custom Settings for Firefox, LibreWolf, Thunderbird
//## Rename this file user.js and copy to the profile folder
//## or append contents to exsiting file
//## Enable userChrome.css (required for tweaks/mods that use a userChrome.css file)
user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true); // disable when using Lepton
user_pref("svg.context-properties.content.enabled", true); // disable when using Lepton
//## Enable compact mode (0=normal, 1=compact, 2=touch mode)
user_pref("browser.compactmode.show", true); // disable when using Lepton
user_pref("browser.uidensity", 1);
//## Hide browser tabs manager button
user_pref("browser.tabs.tabmanager.enabled", false);
//## Disable tab preview thumbnails
user_pref("browser.tabs.hoverPreview.showThumbnails", false);
//## Disable Pocket
user_pref("extensions.pocket.enabled", false);
//## Disable Sync
user_pref("identity.fxaccounts.enabled", false);
//## Disable recommended extensions
user_pref("extensions.htmlaboutaddons.recommendations.enabled", false);
//## Disable overlay scrollbars
user_pref("widget.gtk.overlay-scrollbars.enabled", false);
//## Make scrollbars thicker
user_pref("widget.non-native-theme.gtk.scrollbar.thumb-size", "1.0");
user_pref("widget.non-native-theme.scrollbar.size.override", 12);
//## Open search in new tab
user_pref("browser.search.openintab", true);
//## Disable Favicons
user_pref("browser.chrome.favicons", false);
user_pref("browser.chrome.site_icons", false);
user_pref("browser.newtabpage.activity-stream.feeds.favicon", false);
user_pref("browser.shell.shortcutFavicons", false);
//## Disable closing on last tab
user_pref("browser.tabs.closeWindowWithLastTab", false);
//## Fix backspace key action in Linux
user_pref("browser.backspace_action", 0);
//## Set display scaling
//user_pref("layout.css.devPixelsPerPx", "-1.0");
//## Set display DPI
user_pref("layout.css.dpi", 0);
//## Set zoom text only
user_pref("browser.zoom.full", false);
//user_pref("browser.zoom.siteSpecific", false);
//## Select all text when clicking the URL bar
user_pref("browser.urlbar.clickSelectsAll", true);
//## Disable media autoplay
user_pref("media.autoplay.allow-extension-background-pages", false);
//user_pref("media.autoplay.allow-muted", false);
user_pref("media.autoplay.blocking_policy", 2); // (0=none?, 1=?, 2=gestures needed?)
user_pref("media.autoplay.block-webaudio", true);
user_pref("media.autoplay.default", 5); // (0=allow, 1=block audio, 2=prompt, 5=block audio+video)
//## Prevent web sites from disabling right-click menu & copying
user_pref("dom.event.clipboardevents.enabled", false);
user_pref("dom.event.contextmenu.enabled", false);
user_pref("services.sync.prefs.sync.dom.event.contextmenu.enabled", false);
//## Limit number of network connections (Not needed on high speed/bandwidth networks)
//user_pref("network.websocket.max-connections", 0);
//## Reduce disk activity & disable disk caching
user_pref("browser.cache.disk_cache_ssl", false);
user_pref("browser.cache.disk.capacity", 0);
user_pref("browser.cache.disk.enable", false);
user_pref("browser.cache.disk.filesystem_reported", "");
user_pref("browser.cache.memory.capacity", 1048576); // (524288 for 512 MB or 1048576 for 1GB)
user_pref("browser.cache.memory.enable", true);
user_pref("browser.cache.memory.max_entry_size", 51200);
user_pref("browser.cache.offline.capacity", 0);
user_pref("browser.cache.offline.enable", false);
user_pref("browser.sessionhistory.max_entries", 10);
user_pref("browser.sessionstore.cleanup.forget_closed_after", 48000000);
user_pref("browser.sessionstore.idleDelay", 48000000);
user_pref("browser.sessionstore.interval.idle", 48000000);
user_pref("browser.sessionstore.interval", 48000000);
user_pref("browser.sessionstore.max_resumed_crashes", 0);
user_pref("browser.sessionstore.max_tabs_undo", 0);
user_pref("browser.sessionstore.max_windows_undo", 0);
user_pref("browser.sessionstore.privacy_level", 2);
user_pref("browser.sessionstore.restore_on_demand", false);
user_pref("browser.sessionstore.resume_from_crash", false);
user_pref("browser.sessionstore.upgradeBackup.maxUpgradeBackups", 0);
//## Disable Telemetry
user_pref("app.normandy.api_url", "");
user_pref("app.normandy.enabled", false);
user_pref("app.normandy.user_id", "");
user_pref("app.shield.optoutstudies.enabled", false);
user_pref("beacon.enabled", false);
user_pref("browser.newtabpage.activity-stream.feeds.telemetry", false);
user_pref("browser.newtabpage.activity-stream.telemetry.structuredIngestion.endpoint", "");
user_pref("browser.newtabpage.activity-stream.telemetry", false);
user_pref("browser.newtabpage.activity-stream.unifiedAds.endpoint", "");
user_pref("browser.newtabpage.activity-stream.telemetry.ut.events", false);
user_pref("browser.ping-centre.telemetry", false);
user_pref("browser.search.serpEventTelemetry.enabled", false);
user_pref("browser.search.serpEventTelemetryCategorization.enabled", false);
user_pref("datareporting.healthreport.infoURL", "");
user_pref("datareporting.healthreport.uploadEnabled", false);
user_pref("datareporting.policy.dataSubmissionEnabled", false);
user_pref("datareporting.policy.firstRunURL", "");
user_pref("security.protectionspopup.recordEventTelemetry", false);
user_pref("toolkit.coverage.opt-out", true);
user_pref("toolkit.telemetry.archive.enabled", false);
user_pref("toolkit.telemetry.bhrPing.enabled", false);
user_pref("toolkit.telemetry.coverage.opt-out", true);
user_pref("toolkit.telemetry.dap.helper.url", "");
user_pref("toolkit.telemetry.dap.leader.url", "");
user_pref("toolkit.telemetry.enabled", false);
user_pref("toolkit.telemetry.firstShutdownPing.enabled", false);
user_pref("toolkit.telemetry.newProfilePing.enabled", false);
user_pref("toolkit.telemetry.reportingpolicy.firstRun", false);
user_pref("toolkit.telemetry.server_owner", "");
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);
//## Privacy & Security
user_pref("accessibility.force_disabled", 1);
user_pref("browser.newtabpage.pinned", "");
user_pref("browser.urlbar.speculativeConnect.enabled", false);
user_pref("captivedetect.canonicalURL", "");
user_pref("dom.battery.enabled", false);
user_pref("dom.event.clipboardevents.enabled", false);
user_pref("dom.private-attribution.submission.enabled", false); //default in LibreWolf
user_pref("dom.push.connection.enabled", false);
user_pref("dom.push.enabled", false);
user_pref("dom.push.serverURL", "");
user_pref("dom.push.userAgentID", "");
user_pref("dom.serviceWorkers.enabled", false);
user_pref("extensions.screenshots.disabled", true);
user_pref("geo.enabled", false);
user_pref("geo.provider.geoclue.always_high_accuracy", false);
user_pref("geo.provider.network.url", ""); // Unset or use Mozilla URL below:
//user_pref("geo.provider.network.url", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
user_pref("geo.provider.use_geoclue", false);
user_pref("media.navigator.enabled", false);
user_pref("media.peerconnection.enabled", false);
user_pref("network.captive-portal-service.enabled", false);
user_pref("network.connectivity-service.enabled", false);
//user_pref("network.dns.disableIPv6", true); // Not needed if IPv6 disabled in OS
user_pref("network.dns.disablePrefetch", true);
user_pref("network.IDN_show_punycode", true);
user_pref("network.prefetch-next", false);
user_pref("network.trr.exclude-etc-hosts", false);
user_pref("network.trr.mode", 5);
//user_pref("privacy.query_stripping.enabled.pbmode", true); // Not needed with uBo clear URL list
//user_pref("privacy.query_stripping.enabled", true); // Not needed with uBo clear URL list
//user_pref("privacy.trackingprotection.enabled", true);
user_pref("services.sync.prefs.sync.app.shield.optoutstudies.enabled", false);
user_pref("services.sync.prefs.sync.browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", false);
user_pref("services.sync.prefs.sync.browser.newtabpage.activity-stream.showSponsored", false);
user_pref("services.sync.prefs.sync.browser.newtabpage.activity-stream.showSponsoredTopSites", false);
//## Change update check intervals
//user_pref("app.update.interval", 28800);
//user_pref("app.update.promptWaitTime", 28800);
//user_pref("extensions.update.interval", 21600);
//## Enable WebRender & Hardware Acceleration
//user_pref("layers.acceleration.force-enabled", true);
//user_pref("media.ffmpeg.vaapi-drm-display.enabled", true);
//user_pref("media.ffmpeg.vaapi.enabled", true);
//user_pref("media.ffvpx.enabled", true);
//user_pref("media.navigator.mediadatadecoder_vpx_enabled", true);
//user_pref("media.rdd-vpx.enabled", true);
//user_pref("security.sandbox.content.level", 0);
//## Disable JavaScript (breaks many web sites)
//user_pref("pdfjs.enableScripting", false);
//user_pref("javascript.enabled", false);
//## Disable WebGL (breaks many web sites)
//user_pref("webgl.disabled", true);
//## These privacy/security tweaks break stuff:
//user_pref("dom.webnotifications.enabled", false); //(breaks stuff)
//user_pref("media.eme.enabled", false); //(Disables DRM/Widevine)
//user_pref("network.http.sendRefererHeader", 0); //(0 breaks Ubuntu login. Default is 2)
//user_pref("privacy.firstparty.isolate", true); //(forgets saved logins)
//user_pref("privacy.resistFingerprinting", true); //(forgets window size, breaks time zone in Thunderbird)
