Personal Firefox Preferences (add to ~/.mozilla/firefox/PROFILE/user.js

user.js

user_pref("app.normandy.api_url", "");
user_pref("app.normandy.enabled", false);
user_pref("app.shield.optoutstudies.enabled", false);
user_pref("app.update.auto", false);
user_pref("beacon.enabled", false);
user_pref("breakpad.reportURL", "");
user_pref("browser.aboutConfig.showWarning", false);
user_pref("browser.cache.offline.enable", false);
user_pref("browser.crashReports.unsubmittedCheck.autoSubmit", false);
user_pref("browser.crashReports.unsubmittedCheck.autoSubmit2", false);
user_pref("browser.crashReports.unsubmittedCheck.enabled", false);
user_pref("browser.disableResetPrompt", true);
user_pref("browser.newtabpage.activity-stream.section.highlights.includePocket", false);
user_pref("browser.newtabpage.enhanced", false);
user_pref("browser.newtabpage.introShown", true);
user_pref("browser.safebrowsing.appRepURL", "");
user_pref("browser.safebrowsing.blockedURIs.enabled", false);
user_pref("browser.safebrowsing.downloads.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.url", "");
user_pref("browser.safebrowsing.enabled", false);
user_pref("browser.safebrowsing.malware.enabled", false);
user_pref("browser.safebrowsing.phishing.enabled", false);
user_pref("browser.selfsupport.url", "");
user_pref("browser.send_pings", false);
user_pref("browser.sessionstore.privacy_level", 2);
user_pref("browser.shell.checkDefaultBrowser", false);
user_pref("browser.startup.homepage_override.mstone", "ignore");
user_pref("browser.tabs.crashReporting.sendReport", false);
user_pref("browser.urlbar.speculativeConnect.enabled", false);
user_pref("browser.urlbar.trimURLs", false);
user_pref("datareporting.healthreport.service.enabled", false);
user_pref("datareporting.healthreport.uploadEnabled", false);
user_pref("datareporting.policy.dataSubmissionEnabled", false);
user_pref("device.sensors.ambientLight.enabled", false);
user_pref("device.sensors.enabled", false);
user_pref("device.sensors.motion.enabled", false);
user_pref("device.sensors.orientation.enabled", false);
user_pref("device.sensors.proximity.enabled", false);
user_pref("dom.battery.enabled", false);
user_pref("dom.event.clipboardevents.enabled", false);
user_pref("dom.webaudio.enabled", false);
user_pref("experiments.activeExperiment", false);
user_pref("experiments.enabled", false);
user_pref("experiments.manifest.uri", "");
user_pref("experiments.supported", false);
user_pref("extensions.getAddons.cache.enabled", false);
user_pref("extensions.getAddons.showPane", false);
user_pref("extensions.pocket.enabled", false);
user_pref("extensions.shield-recipe-client.api_url", "");
user_pref("extensions.shield-recipe-client.enabled", false);
user_pref("extensions.webservice.discoverURL", "");
user_pref("media.autoplay.default", 1);
user_pref("media.autoplay.enabled", false);
user_pref("media.navigator.enabled", false);
user_pref("media.peerconnection.enabled", false);
user_pref("media.video_stats.enabled", false);
user_pref("network.IDN_show_punycode", true);
user_pref("network.allow-experiments", false);
user_pref("network.captive-portal-service.enabled", false);
user_pref("network.cookie.cookieBehavior", 1);
user_pref("network.dns.disablePrefetch", true);
user_pref("network.dns.disablePrefetchFromHTTPS", true);
user_pref("network.http.referer.XOriginPolicy", 2);
user_pref("network.http.speculative-parallel-limit", 0);
user_pref("network.predictor.enable-prefetch", false);
user_pref("network.predictor.enabled", false);
user_pref("network.prefetch-next", false);
user_pref("network.trr.mode", 5);
user_pref("privacy.donottrackheader.enabled", true);
user_pref("privacy.donottrackheader.value", 1);
user_pref("privacy.trackingprotection.cryptomining.enabled", true);
user_pref("privacy.trackingprotection.enabled", true);
user_pref("privacy.trackingprotection.fingerprinting.enabled", true);
user_pref("privacy.trackingprotection.pbmode.enabled", true);
user_pref("privacy.usercontext.about_newtab_segregation.enabled", true);
user_pref("security.ssl.disable_session_identifiers", true);
user_pref("services.sync.prefs.sync.browser.newtabpage.activity-stream.showSponsoredTopSite", false);
user_pref("signon.autofillForms", false);
user_pref("toolkit.telemetry.archive.enabled", false);
user_pref("toolkit.telemetry.bhrPing.enabled", false);
user_pref("toolkit.telemetry.cachedClientID", "");
user_pref("toolkit.telemetry.enabled", false);
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.prompted", 2);
user_pref("toolkit.telemetry.rejected", true);
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.unifiedIsOptIn", false);
user_pref("toolkit.telemetry.updatePing.enabled", false);
user_pref("webgl.disabled", true);
user_pref("webgl.renderer-string-override", " ");
user_pref("webgl.vendor-string-override", " ");

/**********
 * Personal
**********/
 
// Set URL Bar Double-Click To Select Word
user_pref("browser.urlbar.clickSelectsAll", false);
user_pref("browser.urlbar.doubleClickSelectsAll", false);
 
// show protocol in urlbar
user_pref("browser.urlbar.trimURLs", false);
 
// Fix tab width too small
user_pref("browser.tabs.tabMinWidth", 120);
 
// Increase disk write timer to prevent SSD from dying 
//Source: https://www.servethehome.com/firefox-is-eating-your-ssd-here-is-how-to-fix-it/
user_pref("browser.sessionstore.interval", 120000);
 
// disable onboarding junk
user_pref("browser.onboarding.enabled", false);
 
// limit offline data storage
user_pref("browser.cache.offline.capacity", 50000);
user_pref("browser.cache.disk.capacity", 50000);
 
// upgrade all connections to HTTPS
user_pref("dom.security.https_only_mode", true);
 
// restore previous sessionstore
user_pref("browser.startup.page", 3);
 
// Content Processes
user_pref("dom.ipc.processCount", 12);
 
// spell-check all
user_pref("layout.spellcheckDefault", 2);
 
// pocket top stories
user_pref("browser.newtabpage.activity-stream.feeds.section.topstories", false);
user_pref("browser.newtabpage.activity-stream.feeds.system.topstories", false);

// allow auto install extensions
user_pref("extensions.autoDisableScopes", 0);
user_pref("extensions.enabledScopes", 3);
user_pref("extensions.startupScanScopes", 3);
user_pref("extensions.installDistroAddons", true);

// Highlight all search words
user_pref("findbar.highlightAll", true);

// Minimum font size
user_pref("font.minimum-size.th", 13);

// dark theme inspector dev tools
user_pref("devtools.theme", "dark");

// right-side devtools
user_pref("devtools.toolbox.host", "right");

// Disable Delay When Installing Add-ons
user_pref("security.dialog_enable_delay", 0);

// Turn Off ToolTips
user_pref("browser.chrome.toolbar_tips", false);

// Session Restore Saving Frequency (1min def=15sec)
user_pref("browser.sessionstore.interval", 60000);

// Extend Script Execution Time (20sec def=10sec)
user_pref("dom.max_script_run_time", 20);

// Open all JavaScript windows the same way you have Firefox handle new windows
user_pref("browser.link.open_newwindow.restriction", 0);

// Description: Increase save as timeout (for content header) (6sec def=4sec)
user_pref("Browser.download.saveLinkAsFilenameTimeout", 6000);

// open urlbar search in new tab
user_pref("browser.urlbar.openintab", true);

// Load bookmarks in tabs
user_pref("browser.tabs.loadBookmarksInTabs", true);