dotfiles/.config/firefox/user.js

// to enable userChrome settings
user_pref("toolkit.legacyUserProfileCustomizations.stylesheets",    true);

// disable Mozilla telemetry
user_pref("toolkit.telemetry.enabled",				                false);
user_pref("toolkit.telemetry.unified",				                false);
user_pref("experiments.supported",				                    false);
user_pref("experiments.enabled",				                    false);
user_pref("experiments.manifest.uri",				                "");

// disable Necko to do A/B testing
user_pref("network.allow-experiments",                              false);

// disable crash reports
user_pref("breakpad.reportURL",					                    "");
user_pref("browser.tabs.crashReporting.sendReport",		            false);
user_pref("browser.crashReports.unsubmittedCheck.enabled",	        false);
user_pref("dom.ipc.plugins.flash.subprocess.crashreporter.enabled",	false);

// disable sending health reports
user_pref("datareporting.healthreport.uploadEnabled",               false);
user_pref("datareporting.healthreport.service.enabled",             false);
user_pref("datareporting.policy.dataSubmissionEnabled",             false);

// disable Mozilla user rating telemetry
user_pref("browser.selfsupport.url",				                "");

// enable tracking protection
user_pref("privacy.trackingprotection.enabled",			            true);
user_pref("privacy.trackingprotection.pbmode.enabled",		        true);

// disable built-in PDF viewer
user_pref("pdfjs.disabled",					                        true);

// disable WebRTC getUserMedia, screen sharing, audio capture, video capture
user_pref("media.navigator.enabled",				                false);
user_pref("media.navigator.video.enabled",			                false);
user_pref("media.getusermedia.screensharing.enabled",		        false);
user_pref("media.getusermedia.audiocapture.enabled",		        false);

// disable beacon async HTTP transfers (used for analytics)
user_pref("beacon.enabled",					                        false);

// do not automatically send selection to clipboard
user_pref("clipboard.autocopy",					                    false);

// don"t monitor OS online connection state
user_pref("network.manage-offline-status",			                false);

// disable video stats to reduce fingerprinting threat
user_pref("media.video_stats.enabled",				                false);

// disable font fingerprinting
user_pref("browser.display.use_document_fonts",			            0);


// opt out of addon metadata updates
user_pref("extensions.getAddons.cache.enabled",			            false);

// update addons automatically
user_pref("extensions.update.enabled",								true);

// enable addon and certificate blocklists from Mozilla
user_pref("extensions.blocklist.enabled",           				true);
user_pref("services.blocklist.update_enabled",          			true);
user_pref("extensions.blocklist.url",               				"https://blocklist.addons.mozilla.org/blocklist/3/%APP_ID%/%APP_VERSION%/");

// disable remote debugging
user_pref("devtools.debugger.remote-enabled",           			false);
user_pref("devtools.chrome.enabled",                				false);
user_pref("devtools.debugger.force-local",          				true);

// disable pocket
user_pref("browser.pocket.enabled",				                    false);
user_pref("extensions.pocket.enabled",				                false);
user_pref("browser.newtabpage.activity-stream.feeds.section.topstories",	false);

// disable form autofill, don't save information entered in web page forms
user_pref("browser.formfill.enable",				                false);
user_pref("signon.autofillForms",				                    false);
user_pref("signon.formlessCapture.enabled",			                false);

// show in-content login form warning UI for insecure login fields
user_pref("security.insecure_field_warning.contextual.enabled",     true);
user_pref("security.insecure_password.ui.enabled",		            true);