Custom Firefox user.js and userChrome.css

user.js

  
/******************************************************************************
 * Privacy                                                                    *
 ******************************************************************************/

// Disable Location-Aware Browsing (geolocation)
user_pref("geo.enabled", false);

// Enable hardening against various fingerprinting vectors (Tor Uplift project)
// Note this can break the ability to remember the window size of Firefox on startup
//user_pref("privacy.resistFingerprinting", true);

// Enable first-party isolation
//user_pref("privacy.firstparty.isolate", true);

// Disable WebRTC to prevent leaking inernal IP addresses
user_pref("media.peerconnection.enabled", false);
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);

// Accept only first party cookies
user_pref("network.cookie.cookieBehavior", 1);

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

// Disable leaking network/browser connection type via Javascript (WiFi, cellular, etc.)
user_pref("dom.netinfo.enabled", false);

// Disable sensor API
user_pref("device.sensors.enabled", false);

// Disable battery API
user_pref("dom.battery.enabled", false);

// Disable gamepad API to prevent USB device enumeration
user_pref("dom.gamepad.enabled", false);

// Disable virtual reality devices APIs
user_pref("dom.vr.enabled", false);

// Disable vibrator API
user_pref("dom.vibrator.enabled", false);

// Disable FlyWeb (discovery of LAN/proximity IoT devices that expose a Web interface)
user_pref("dom.flyweb.enabled", false);

// Disable webGL
user_pref("webgl.disabled", true);

// Disable speech recognition
user_pref("media.webspeech.recognition.enable", false);

// Disable speech synthesis
user_pref("media.webspeech.synth.enabled", false);

// Disable face detection
user_pref("camera.control.face_detection.enabled", false);

// Don't monitor OS online/offline connection state
user_pref("network.manage-offline-status", false);

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

// Do not download URLs for the offline cache
user_pref("browser.cache.offline.enable", false);

// Disable sending Flash Player crash reports
user_pref("dom.ipc.plugins.flash.subprocess.crashreporter.enabled",	false);
user_pref("dom.ipc.plugins.reportCrashURL", false);

// Disable permissions to access the camera, notifications, location, and microphone
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);


/******************************************************************************
 * Security                                                                   *
 ******************************************************************************/
 
// Enforce a security delay when installing add-ons (in milliseconds)
user_pref("security.dialog_enable_delay", 1000);

// Enable Punycode for Internationalized Domain Names to eliminate possible spoofing
user_pref("network.IDN_show_punycode", true);

// Disable remembering logins
user_pref("signon.rememberSignons", false);

// Don't trim http:// off of URLs in the address bar
user_pref("browser.urlbar.trimURLs", false);

// Disable url formatting (different colours for domain and remainer of section)
user_pref("browser.urlbar.formatting.enabled", false);

// Don't try to guess domain names when entering an invalid domain name in URL bar
user_pref("browser.fixup.alternate.enabled", false);
user_pref("browser.fixup.hide_user_pass", true);

// Enable insecure connection warnings
user_pref("security.insecure_connection_text.enabled", true);
user_pref("security.insecure_connection_text.pbmode.enabled", true);

// Enable insecure password warnings (login forms in non-HTTPS pages)
user_pref("security.insecure_password.ui.enabled", true);

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

// disable HTTP2 (which was based on SPDY which is now deprecated)
user_pref("network.http.spdy.enabled", false);
user_pref("network.http.spdy.enabled.deps", false);
user_pref("network.http.spdy.enabled.http2", false);


/******************************************************************************
 * Firefox features and components                                            *
 ******************************************************************************/

// Enable Firefox Tracking Protection
user_pref("privacy.trackingprotection.enabled", true);
user_pref("privacy.trackingprotection.pbmode.enabled", true);

// Enable Safebrowsing (blocking reported web forgeries and attack sites)
user_pref("browser.safebrowsing.phishing.enabled", true);
user_pref("browser.safebrowsing.malware.enabled", true);

// Disable Firefox Account/Sync
user_pref("identity.fxaccounts.enabled", false);

// Disable Pocket
user_pref("extensions.pocket.enabled", false);

// Disable Reader
user_pref("reader.parse-on-load.enabled", false);

// Disable WebIDE
user_pref("devtools.webide.enabled", false);
user_pref("devtools.webide.autoinstallADBHelper", false);
user_pref("devtools.webide.autoinstallFxdtAdapters", false);

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

// Disable querying Google application reputation database for downloaded files
user_pref("browser.safebrowsing.downloads.remote.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.url", "");

// Disable onboarding
user_pref("browser.onboarding.enabled", false);
user_pref("devtools.onboarding.telemetry.logged", false);

// Disable Normandy studies
user_pref("app.normandy.enabled", false);
user_pref("app.normandy.first_run", false);
user_pref("app.normandy.api_url", "");
user_pref("app.normandy.user_id", "");

// Disable Shield
user_pref("app.shield.optoutstudies.enabled", false);
user_pref("extensions.shield-recipe-client.enabled", false);
user_pref("extensions.shield-recipe-client.user_id", "");
user_pref("extensions.shield-recipe-client.api_url", "");

// Disable telemetry
user_pref("toolkit.telemetry.enabled", false);
user_pref("toolkit.telemetry.rejected", true);
user_pref("toolkit.telemetry.unified", false);
user_pref("toolkit.telemetry.archive.enabled", false);
user_pref("toolkit.telemetry.bhrPing.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.shutdownPingSender.enabled", false);
user_pref("toolkit.telemetry.unifiedIsOptIn", false);
user_pref("toolkit.telemetry.updatePing.enabled", false);
user_pref("toolkit.telemetry.cachedClientID", "");
user_pref("toolkit.telemetry.hybridContent.enabled", false);

// Disable ping center telemetry
user_pref("browser.ping-centre.telemetry", false);

// Disable experiments
user_pref("experiments.enabled", false);
user_pref("experiments.supported", false);
user_pref("experiments.manifest.uri", "");
user_pref("network.allow-experiments", false);

// Disable sending Firefox crash reports to Mozilla servers
user_pref("breakpad.reportURL", "");

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

// Disable sending reports of tab crashes to Mozilla (about:tabcrashed), don't nag user about unsent crash reports
user_pref("browser.tabs.crashReporting.sendReport", false);
user_pref("browser.crashReports.unsubmittedCheck.enabled", false);

// Disable error reporter
user_pref("browser.chrome.errorReporter.enabled", false);
user_pref("browser.chrome.errorReporter.submitUrl", "");

// Disable collecting/sending health report (healthreport.sqlite*)
user_pref("datareporting.healthreport.uploadEnabled", false);
user_pref("datareporting.healthreport.service.enabled", false);
user_pref("datareporting.policy.dataSubmissionEnabled", false);


/******************************************************************************
 * Extensions / Plugins                                                       *
 ******************************************************************************/
 
// Disable about:addons' Get Add-ons panel (uses Google-Analytics)
user_pref("extensions.getAddons.showPane", false); // hidden pref
user_pref("extensions.webservice.discoverURL", "");

// Disable Screenshots
user_pref("extensions.screenshots.disabled", true);
user_pref("extensions.screenshots.upload-disabled", true);

// Disable scanning for plugins (used to detect flash, java, etc..)
user_pref("plugin.scan.plid.all", false);

// Disable NPAPI plugins (0 = disabled, 1 = ask, 2 = enabled)
user_pref("plugin.state.flash", 0);
user_pref("plugin.state.java", 0);

// Decrease system information leakage to Mozilla extension blocklist update servers
user_pref("extensions.blocklist.url", "https://blocklist.addons.mozilla.org/blocklist/3/%APP_ID%/%APP_VERSION%/");


/******************************************************************************
 * Automatic connections / Pre-fetching                                       *
 ******************************************************************************/

// Disable automatic updates (still autocheck for updates and install manually)
user_pref("app.update.auto", false);

// Disable automatic search engine updates
user_pref("browser.search.update", false);

// Disable the background update service
user_pref("app.update.service.enabled", false);

// Disable background update staging
user_pref("app.update.staging.enabled", false);

// Disable automatic extension metadata updating (sends daily pings to Mozilla about extensions and recent startups)
user_pref("extensions.getAddons.cache.enabled", false);

// Disable automatic updating of personas/themes
user_pref("lightweightThemes.update.enabled", false);

// Disable automatic retrieval of search engine suggestions when typing in the address bar
user_pref("browser.search.suggest.enabled", false);

// Disable prefetching of <link rel="next"> URLs
user_pref("network.prefetch-next", false);

// Disable DNS prefetching
user_pref("network.dns.disablePrefetch", true);
user_pref("network.dns.disablePrefetchFromHTTPS", true); // hidden pref

// Disable the predictive service (Necko)
user_pref("network.predictor.enabled", false);

// Disable captive portal
user_pref("network.captive-portal-service.enabled", false);
user_pref("captivedetect.canonicalURL", "");

// Disable speculative pre-connections (preloading of autocomplete URLs)
user_pref("network.http.speculative-parallel-limit", 0);

// Disable downloading home page snippets/messages from Mozilla
user_pref("browser.aboutHomeSnippets.updateUrl", "");

// Disable pinging URIs specified in HTML <a> ping= attributes (but enforce same host just in case)
user_pref("browser.send_pings", false);
user_pref("browser.send_pings.require_same_host", true);


/*******************************************************************************
 * Newtab functionality                                                        *
 *******************************************************************************/
 
// Disable new tab page and show a blank tab instead
user_pref("browser.newtabpage.enabled", false);
user_pref("browser.newtab.url", "about:blank");

// Disable ads & preload
user_pref("browser.newtabpage.enhanced", false);
user_pref("browser.newtab.preload",	false);

// Disable activity stream and recommended stories
user_pref("browser.newtabpage.activity-stream.enabled", false);
user_pref("browser.newtabpage.activity-stream.feeds.section.topstories", false);


/*******************************************************************************
 * Misc tweaks                                                              *
 *******************************************************************************/

// Disable accessibility service
user_pref("accessibility.force_disabled", 1);

// Disable about:config warning page
user_pref("general.warnOnAboutConfig", false);

// Disable warning when closing multiple tabs
user_pref("browser.tabs.warnOnClose", false);

// Disable cosmetic animations
user_pref("toolkit.cosmeticAnimations.enabled", false);
  
// Disable UITour backend
user_pref("browser.uitour.enabled", false);
user_pref("browser.uitour.url", "");

// Disable ctrl+tab image previews
user_pref("browser.ctrlTab.previews", false);

// Disable auto+smooth scrolling
user_pref("general.autoScroll", false);
user_pref("general.smoothScroll", false);

// Disable spell checker
user_pref("layout.spellcheckDefault", 0);

// Disable copying extra spaces around words when using copy/paste
user_pref("layout.word_select.eat_space_to_next_word", false);

// Increase the minimum tab width (default: 75)
user_pref("browser.tabs.tabMinWidth", 100);

userChrome.css

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

.tab-throbber[busy]::before {
  background-image: url("chrome://global/skin/icons/loading.png") !important;
  animation: unset !important;
}
.tab-throbber[busy]:not([progress])::before {
  /* Grays the blue during "Connecting" state */
  filter: grayscale(100%);
}
@media (min-resolution: 2dppx) {
  .tab-throbber[busy]::before {
    background-image: url("chrome://global/skin/icons/loading@2x.png") !important;
  }
}

:root {
  --tab-curve-width: 30px;
  --tabs-border: transparent !important;
}

.arrowscrollbox-scrollbox {
  padding-inline-start: 10px !important;
}

/* To be able to see the top border of the tab */
.tab-stack {
  margin-top: 2px !important;
}

/* When the window is maximized, the first pinned tab is properly displayed. */
#TabsToolbar  {
  padding-inline-start: 15px !important;
}

#tabbrowser-tabs{
	margin-left:-15px;
}

.titlebar-placeholder {
  border: none !important;
}

/* Remove unneeded styles from Photon */
.tabbrowser-tab::before,
.tabbrowser-tab::after {
  border: none !important;
}

/* Windows 7 specific */
@media (-moz-os-version: windows-win7) {
  .tabbrowser-tab {
    background-color: transparent !important;
    border: none !important;
  }

  @media (-moz-windows-default-theme) {
    .tabbrowser-tab:not(:-moz-lwtheme) {
      background-color: transparent !important;
      border: none !important;
    }
  }
}

.tabbrowser-tab > .tab-stack > .tab-background {
  background-image: none !important;
  -moz-box-orient: horizontal !important;
  background-color: transparent !important;
  margin-top: 1px !important;
}

.tab-background[selected="true"] {
  border: none !important;
  pointer-events: none !important;
}

.tab-line {
  display: none !important;
}

.tab-bottom-line {
  display: none !important;
}

/* Match height of new tab button (right svg) on hover */
.tabs-newtab-button {
  margin: 0 !important;
}

/* overlap the tab curves */
.tab-background {
  -moz-margin-end: -15px !important;
  -moz-margin-start: -15px !important;
}

/* Begin tab background customizations */
.tab-background[selected="true"]::before {
  border: none !important;
  content: "" !important;
  width: 30px !important;
  min-height: 30px !important;
  display: -moz-box !important;
  background-repeat: no-repeat !important;
}

.tab-background[selected="true"]::after {
  border: none !important;
  content: "" !important;
  width: 30px !important;
  min-height: 30px !important;
  display: -moz-box !important;
  background-repeat: no-repeat !important;
}

.tab-background[selected="true"] > spacer {
  margin-top: 0px !important;
}

#new-tab-button,
.tabs-newtab-button {
  width: calc(36px + 30px) !important;
  margin-inline-start: -15px !important;
  margin-top: 1px !important;
}

/* Tab hover customizations */

/* Regular tabs */
.tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected=true])::before {
  display: -moz-box !important;
  background-repeat: no-repeat !important;
  content: "" !important;
  width: 30px !important;
  max-height: 30px !important;
  background-color: transparent !important;
}

.tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected=true])::after {
  display: -moz-box !important;
  background-repeat: no-repeat !important;
  content: "" !important;
  width: 30px !important;
  max-height: 30px !important;
  background-color: transparent !important;
}

.tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected=true]) > spacer {
  margin-top: 0px !important;
}

#TabsToolbar[brighttext] > #tabbrowser-tabs > .tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected="true"]),
.tabs-newtab-button:hover,
.tabs-newtab-button:hover::before,
.tabs-newtab-button:hover::after {
  background-color: transparent !important;
}

/* New tab hover customizations */
.tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected="true"]), .tabs-newtab-button:hover {
  background-position: 0px 2px, 30px 4px , 36px 2px !important;
  background-repeat: no-repeat !important;
  background-size: 30px 30px, calc(100% - (2 * 30px)) 30px, 30px !important;
}

.tabs-newtab-button:hover > .toolbarbutton-icon {
  background: none !important;
  background-color: transparent !important;
}


/* Color specific customizations */
:root {
  --svg-selected-before: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' xmlns:svg='http://www.w3.org/2000/svg' width='30px' height='31px' preserveAspectRatio='none'><defs><svg:clipPath id='tab-curve-clip-path-start' clipPathUnits='objectBoundingBox'><svg:path d='m 1,0.0625 0.05,0 0,0.938 -1,0 0,-0.028 C 0.32082458,0.95840561 0.4353096,0.81970962 0.48499998,0.5625 0.51819998,0.3905 0.535,0.0659 1,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-curve-clip-path-end' clipPathUnits='objectBoundingBox'><svg:path d='m 0,0.0625 -0.05,0 0,0.938 1,0 0,-0.028 C 0.67917542,0.95840561 0.56569036,0.81970962 0.51599998,0.5625 0.48279998,0.3905 0.465,0.0659 0,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-hover-clip-path' clipPathUnits='objectBoundingBox'><svg:path d='M 0,0.2 0,1 1,1, 1,0.2 z'/></svg:clipPath></defs><foreignObject width='30' height='31' clip-path='url(%23tab-curve-clip-path-start)'><div id='tab-background-fill' style='background-color:rgb(249,249,250);background-repeat:no-repeat;height:100%;width:100%;' xmlns='http://www.w3.org/1999/xhtml'></div></foreignObject></svg>");

  --svg-selected-after: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' xmlns:svg='http://www.w3.org/2000/svg' width='30px' height='31px' preserveAspectRatio='none'><defs><svg:clipPath id='tab-curve-clip-path-start' clipPathUnits='objectBoundingBox'><svg:path d='m 1,0.0625 0.05,0 0,0.938 -1,0 0,-0.028 C 0.32082458,0.95840561 0.4353096,0.81970962 0.48499998,0.5625 0.51819998,0.3905 0.535,0.0659 1,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-curve-clip-path-end' clipPathUnits='objectBoundingBox'><svg:path d='m 0,0.0625 -0.05,0 0,0.938 1,0 0,-0.028 C 0.67917542,0.95840561 0.56569036,0.81970962 0.51599998,0.5625 0.48279998,0.3905 0.465,0.0659 0,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-hover-clip-path' clipPathUnits='objectBoundingBox'><svg:path d='M 0,0.2 0,1 1,1, 1,0.2 z'/></svg:clipPath></defs><foreignObject width='30' height='31' clip-path='url(%23tab-curve-clip-path-end)'><div id='tab-background-fill' style='background-color:rgb(249, 249, 255);background-repeat:no-repeat;height:100%;width:100%;' xmlns='http://www.w3.org/1999/xhtml'></div></foreignObject></svg>");

  --background-selected-middle:
    linear-gradient(rgba(0,0,0,0), rgba(0,0,0,0)),
    linear-gradient(
      transparent
      2px,
      rgb(249,249,255) 2px,
      rgb(249,249,255)
    ),
    none;

  --svg-hover-before: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' xmlns:svg='http://www.w3.org/2000/svg' width='30px' height='30px' preserveAspectRatio='none'><defs><svg:clipPath id='tab-curve-clip-path-start' clipPathUnits='objectBoundingBox'><svg:path d='m 1,0.0625 0.05,0 0,0.938 -1,0 0,-0.028 C 0.32082458,0.95840561 0.4353096,0.81970962 0.48499998,0.5625 0.51819998,0.3905 0.535,0.0659 1,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-curve-clip-path-end' clipPathUnits='objectBoundingBox'><svg:path d='m 0,0.0625 -0.05,0 0,0.938 1,0 0,-0.028 C 0.67917542,0.95840561 0.56569036,0.81970962 0.51599998,0.5625 0.48279998,0.3905 0.465,0.0659 0,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-hover-clip-path' clipPathUnits='objectBoundingBox'><svg:path d='M 0,0.2 0,1 1,1, 1,0.2 z'/></svg:clipPath></defs><foreignObject width='30' height='30' clip-path='url(%23tab-curve-clip-path-start)'><div id='tab-background-fill' style='background-color:rgba(255, 255, 255, .1);background-repeat:no-repeat;height:100%;width:100%;' xmlns='http://www.w3.org/1999/xhtml'></div></foreignObject></svg>");

  --svg-hover-after: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' xmlns:svg='http://www.w3.org/2000/svg' width='30px' height='31px' preserveAspectRatio='none'><defs><svg:clipPath id='tab-curve-clip-path-start' clipPathUnits='objectBoundingBox'><svg:path d='m 1,0.0625 0.05,0 0,0.938 -1,0 0,-0.028 C 0.32082458,0.95840561 0.4353096,0.81970962 0.48499998,0.5625 0.51819998,0.3905 0.535,0.0659 1,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-curve-clip-path-end' clipPathUnits='objectBoundingBox'><svg:path d='m 0,0.0625 -0.05,0 0,0.938 1,0 0,-0.028 C 0.67917542,0.95840561 0.56569036,0.81970962 0.51599998,0.5625 0.48279998,0.3905 0.465,0.0659 0,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-hover-clip-path' clipPathUnits='objectBoundingBox'><svg:path d='M 0,0.2 0,1 1,1, 1,0.2 z'/></svg:clipPath></defs><foreignObject width='30' height='31' clip-path='url(%23tab-curve-clip-path-end)'><div id='tab-background-fill' style='background-color:rgba(255, 255, 255,.1);background-repeat:no-repeat;height:100%;width:100%;' xmlns='http://www.w3.org/1999/xhtml'></div></foreignObject></svg>");

  --background-hover-middle:
    linear-gradient(rgba(0,0,0,0), rgba(0,0,0,0)),
    linear-gradient(
      transparent
      2px,
      rgba(255,255,255,.1) 2px,
      rgba(255,255,255,.1)
    ),
    none;

  --newtab-hover: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' xmlns:svg='http://www.w3.org/2000/svg' width='30px' height='30px' preserveAspectRatio='none'><defs><svg:clipPath id='tab-curve-clip-path-start' clipPathUnits='objectBoundingBox'><svg:path d='m 1,0.0625 0.05,0 0,0.938 -1,0 0,-0.028 C 0.32082458,0.95840561 0.4353096,0.81970962 0.48499998,0.5625 0.51819998,0.3905 0.535,0.0659 1,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-curve-clip-path-end' clipPathUnits='objectBoundingBox'><svg:path d='m 0,0.0625 -0.05,0 0,0.938 1,0 0,-0.028 C 0.67917542,0.95840561 0.56569036,0.81970962 0.51599998,0.5625 0.48279998,0.3905 0.465,0.0659 0,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-hover-clip-path' clipPathUnits='objectBoundingBox'><svg:path d='M 0,0.2 0,1 1,1, 1,0.2 z'/></svg:clipPath></defs><foreignObject width='30' height='31' clip-path='url(%23tab-curve-clip-path-start)'><div id='tab-background-fill' style='background-color:rgba(255,255,255,.1);background-repeat:no-repeat;height:100%;width:100%;' xmlns='http://www.w3.org/1999/xhtml'></div></foreignObject></svg>"),
  linear-gradient(rgba(255,255,255,.1), rgba(255,255,255,.1)),
  url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' xmlns:svg='http://www.w3.org/2000/svg' width='30px' height='31px' preserveAspectRatio='none'><defs><svg:clipPath id='tab-curve-clip-path-start' clipPathUnits='objectBoundingBox'><svg:path d='m 1,0.0625 0.05,0 0,0.938 -1,0 0,-0.028 C 0.32082458,0.95840561 0.4353096,0.81970962 0.48499998,0.5625 0.51819998,0.3905 0.535,0.0659 1,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-curve-clip-path-end' clipPathUnits='objectBoundingBox'><svg:path d='m 0,0.0625 -0.05,0 0,0.938 1,0 0,-0.028 C 0.67917542,0.95840561 0.56569036,0.81970962 0.51599998,0.5625 0.48279998,0.3905 0.465,0.0659 0,0.0625 z'/></svg:clipPath><svg:clipPath id='tab-hover-clip-path' clipPathUnits='objectBoundingBox'><svg:path d='M 0,0.2 0,1 1,1, 1,0.2 z'/></svg:clipPath></defs><foreignObject width='30' height='31' clip-path='url(%23tab-curve-clip-path-end)'><div id='tab-background-fill' style='background-color:rgba(255,255,255,.1);background-repeat:no-repeat;height:100%;width:100%;' xmlns='http://www.w3.org/1999/xhtml'></div></foreignObject></svg>");
}


/* OS-specific color variables */
@media screen and (-moz-windows-theme) {
  :root {

  }
}

@media not screen and (-moz-windows-theme) {
  :root {

  }
}

.tab-background[selected="true"]::before {
  background-image: var(--svg-selected-before) !important;
}

.tab-background[selected="true"]::after {
  background-image: var(--svg-selected-after) !important;
}

.tab-background[selected="true"] > spacer {
  background-image: var(--background-selected-middle) !important;

}

.tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected=true])::before {
  background-image: var(--svg-hover-before) !important;
}

.tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected=true])::after {
  background-image: var(--svg-hover-after)  !important;
}

.tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected=true]) > spacer {
  background-image: var(--background-hover-middle) !important;

}

.tabs-newtab-button:hover {
  background-image: var(--newtab-hover) !important;
}