From af719f1186fca9d7e46428feb9ee9b9cae4fae49 Mon Sep 17 00:00:00 2001
From: Richard Pospesel <richard@torproject.org>
Date: Mon, 4 Mar 2019 16:09:51 -0800
Subject: [PATCH] Bug 25658: Replace security slider with security level UI

This patch adds a new 'securitylevel' component to Tor Browser intended
to replace the torbutton 'Security Slider'.

This component adds a new Security Level toolbar button which visually
indicates the current global security level via icon (as defined by the
extensions.torbutton.security_slider pref), a drop-down hanger with a
short description of the current security level, and a new section in
the about:preferences#privacy page where users can change their current
security level. In addition, the hanger and the preferences page will
show a visual warning when the user has modified prefs associated with
the security level and provide a one-click 'Restore Defaults' button to
get the user back on recommended settings.

Strings used by this patch are pulled from the torbutton extension, but
en-US defaults are provided if there is an error loading from the
extension. With this patch applied, the usual work-flow of "./mach build
&& ./mach run" work as expected, even if the torbutton extension is
disabled.
---
 browser/app/profile/000-tor-browser.js        |   2 +-
 browser/base/content/browser.js               |  10 +
 browser/base/content/browser.xul              |   5 +
 browser/components/moz.build                  |   1 +
 .../preferences/in-content/preferences.xul    |   1 +
 .../preferences/in-content/privacy.js         |  18 +
 .../preferences/in-content/privacy.xul        |   2 +
 .../securitylevel/content/securityLevel.js    | 528 ++++++++++++++++++
 .../content/securityLevelButton.css           |   9 +
 .../content/securityLevelButton.inc.xul       |   5 +
 .../content/securityLevelButton.svg           |  21 +
 .../content/securityLevelPanel.css            |  82 +++
 .../content/securityLevelPanel.inc.xul        |  33 ++
 .../content/securityLevelPreferences.css      |  26 +
 .../content/securityLevelPreferences.inc.xul  |  66 +++
 browser/components/securitylevel/jar.mn       |   6 +
 browser/components/securitylevel/moz.build    |   1 +
 17 files changed, 815 insertions(+), 1 deletion(-)
 create mode 100644 browser/components/securitylevel/content/securityLevel.js
 create mode 100644 browser/components/securitylevel/content/securityLevelButton.css
 create mode 100644 browser/components/securitylevel/content/securityLevelButton.inc.xul
 create mode 100644 browser/components/securitylevel/content/securityLevelButton.svg
 create mode 100644 browser/components/securitylevel/content/securityLevelPanel.css
 create mode 100644 browser/components/securitylevel/content/securityLevelPanel.inc.xul
 create mode 100644 browser/components/securitylevel/content/securityLevelPreferences.css
 create mode 100644 browser/components/securitylevel/content/securityLevelPreferences.inc.xul
 create mode 100644 browser/components/securitylevel/jar.mn
 create mode 100644 browser/components/securitylevel/moz.build

diff --git a/browser/app/profile/000-tor-browser.js b/browser/app/profile/000-tor-browser.js
index f41d6d48b6f8b..74c7f35b98cd5 100644
--- a/browser/app/profile/000-tor-browser.js
+++ b/browser/app/profile/000-tor-browser.js
@@ -250,7 +250,7 @@ pref("extensions.webextensions.ExtensionStorageIDB.enabled", false);
 pref("extensions.allowPrivateBrowsingByDefault", true);
 
 // Toolbar layout
-pref("browser.uiCustomization.state", "{\"placements\":{\"widget-overflow-fixed-list\":[],\"PersonalToolbar\":[\"personal-bookmarks\"],\"nav-bar\":[\"torbutton-button\",\"back-button\",\"forward-button\",\"stop-reload-button\",\"urlbar-container\",\"downloads-button\",\"_73a6fe31-595d-460b-a920-fcc0f8843232_-browser-action\"],\"TabsToolbar\":[\"tabbrowser-tabs\",\"new-tab-button\",\"alltabs-button\"],\"toolbar-menubar\":[\"menubar-items\"],\"PanelUI-contents\":[\"home-button\",\"edit-controls\",\"zoom-controls\",\"new-window-button\",\"save-page-button\",\"print-button\",\"bookmarks-menu-button\",\"history-panelmenu\",\"find-button\",\"preferences-button\",\"add-ons-button\",\"developer-button\",\"https-everywhere-button\"],\"addon-bar\":[\"addonbar-closebutton\",\"status-bar\"]},\"seen\":[\"developer-button\",\"https-everywhere_eff_org-browser-action\",\"_73a6fe31-595d-460b-a920-fcc0f8843232_-browser-action\"],\"dirtyAreaCache\":[\"PersonalToolbar\",\"nav-bar\",\"TabsToolbar\",\"toolbar-menubar\"],\"currentVersion\":14,\"newElementCount\":1}");
+pref("browser.uiCustomization.state", "{\"placements\":{\"widget-overflow-fixed-list\":[],\"PersonalToolbar\":[\"personal-bookmarks\"],\"nav-bar\":[\"back-button\",\"forward-button\",\"stop-reload-button\",\"urlbar-container\",\"torbutton-button\",\"security-level-button\",\"downloads-button\"],\"TabsToolbar\":[\"tabbrowser-tabs\",\"new-tab-button\",\"alltabs-button\"],\"toolbar-menubar\":[\"menubar-items\"],\"PanelUI-contents\":[\"home-button\",\"edit-controls\",\"zoom-controls\",\"new-window-button\",\"save-page-button\",\"print-button\",\"bookmarks-menu-button\",\"history-panelmenu\",\"find-button\",\"preferences-button\",\"add-ons-button\",\"developer-button\"],\"addon-bar\":[\"addonbar-closebutton\",\"status-bar\"]},\"seen\":[\"developer-button\",\"https-everywhere-eff_eff_org-browser-action\",\"_73a6fe31-595d-460b-a920-fcc0f8843232_-browser-action\"],\"dirtyAreaCache\":[\"PersonalToolbar\",\"nav-bar\",\"TabsToolbar\",\"toolbar-menubar\"],\"currentVersion\":14,\"newElementCount\":1}");
 
 // Putting the search engine prefs into this file to fix #11236.
 // Default search engine
diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index a0ed38f36f557..5cebc4ccacafa 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -209,6 +209,11 @@ XPCOMUtils.defineLazyScriptGetter(
   ["DownloadsButton", "DownloadsIndicatorView"],
   "chrome://browser/content/downloads/indicator.js"
 );
+XPCOMUtils.defineLazyScriptGetter(
+  this,
+  ["SecurityLevelButton"],
+  "chrome://browser/content/securitylevel/securityLevel.js"
+);
 XPCOMUtils.defineLazyScriptGetter(
   this,
   "gEditItemOverlay",
@@ -1847,6 +1852,9 @@ var gBrowserInit = {
     // doesn't flicker as the window is being shown.
     DownloadsButton.init();
 
+    // Init the SecuritySettingsButton
+    SecurityLevelButton.init();
+
     // Certain kinds of automigration rely on this notification to complete
     // their tasks BEFORE the browser window is shown. SessionStore uses it to
     // restore tabs into windows AFTER important parts like gMultiProcessBrowser
@@ -2482,6 +2490,8 @@ var gBrowserInit = {
 
     DownloadsButton.uninit();
 
+    SecurityLevelButton.uninit();
+
     gAccessibilityServiceIndicator.uninit();
 
     AccessibilityRefreshBlocker.uninit();
diff --git a/browser/base/content/browser.xul b/browser/base/content/browser.xul
index f5bdf818c1718..42c0d2d47397a 100644
--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -20,6 +20,8 @@
 <?xml-stylesheet href="chrome://browser/content/browser.css" type="text/css"?>
 <?xml-stylesheet href="chrome://browser/content/tabbrowser.css" type="text/css"?>
 <?xml-stylesheet href="chrome://browser/content/downloads/downloads.css" type="text/css"?>
+<?xml-stylesheet href="chrome://browser/content/securitylevel/securityLevelPanel.css"?>
+<?xml-stylesheet href="chrome://browser/content/securitylevel/securityLevelButton.css"?>
 <?xml-stylesheet href="chrome://browser/content/places/places.css" type="text/css"?>
 <?xml-stylesheet href="chrome://browser/content/usercontext/usercontext.css" type="text/css"?>
 <?xml-stylesheet href="chrome://browser/skin/" type="text/css"?>
@@ -620,6 +622,7 @@
 #include ../../components/controlcenter/content/identityPanel.inc.xul
 #include ../../components/controlcenter/content/protectionsPanel.inc.xul
 #include ../../components/downloads/content/downloadsPanel.inc.xul
+#include ../../components/securitylevel/content/securityLevelPanel.inc.xul
 #include browser-allTabsMenu.inc.xul
 
     <hbox id="downloads-animation-container" mousethrough="always">
@@ -1057,6 +1060,8 @@
             </stack>
           </toolbarbutton>
 
+#include ../../components/securitylevel/content/securityLevelButton.inc.xul
+
         <toolbarbutton id="library-button" class="toolbarbutton-1 chromeclass-toolbar-additional subviewbutton-nav"
                        removable="true"
                        onmousedown="PanelUI.showSubView('appMenu-libraryView', this, event);"
diff --git a/browser/components/moz.build b/browser/components/moz.build
index 9de8af8264ea1..111794a7532c0 100644
--- a/browser/components/moz.build
+++ b/browser/components/moz.build
@@ -50,6 +50,7 @@ DIRS += [
     'protocolhandler',
     'resistfingerprinting',
     'search',
+    'securitylevel',
     'sessionstore',
     'shell',
     'syncedtabs',
diff --git a/browser/components/preferences/in-content/preferences.xul b/browser/components/preferences/in-content/preferences.xul
index d8a8611c49752..13c7bcc74ad8f 100644
--- a/browser/components/preferences/in-content/preferences.xul
+++ b/browser/components/preferences/in-content/preferences.xul
@@ -15,6 +15,7 @@
 <?xml-stylesheet href="chrome://browser/skin/preferences/in-content/search.css"?>
 <?xml-stylesheet href="chrome://browser/skin/preferences/in-content/containers.css"?>
 <?xml-stylesheet href="chrome://browser/skin/preferences/in-content/privacy.css"?>
+<?xml-stylesheet href="chrome://browser/content/securitylevel/securityLevelPreferences.css"?>
 
 <!DOCTYPE page>
 
diff --git a/browser/components/preferences/in-content/privacy.js b/browser/components/preferences/in-content/privacy.js
index 140842d8884ff..7583d4e66290f 100644
--- a/browser/components/preferences/in-content/privacy.js
+++ b/browser/components/preferences/in-content/privacy.js
@@ -62,6 +62,12 @@ XPCOMUtils.defineLazyGetter(this, "AlertsServiceDND", function() {
   }
 });
 
+XPCOMUtils.defineLazyScriptGetter(
+  this,
+  ["SecurityLevelPreferences"],
+  "chrome://browser/content/securitylevel/securityLevel.js"
+);
+
 XPCOMUtils.defineLazyServiceGetter(
   this,
   "listManager",
@@ -225,6 +231,17 @@ function dataCollectionCheckboxHandler({
 var gPrivacyPane = {
   _pane: null,
 
+  /**
+   * Show the Security Level UI
+   */
+  _initSecurityLevel() {
+    SecurityLevelPreferences.init();
+    let unload = () => {
+      window.removeEventListener("unload", unload);
+      SecurityLevelPreferences.uninit();
+    };
+  },
+
   /**
    * Whether the prompt to restart Firefox should appear when changing the autostart pref.
    */
@@ -350,6 +367,7 @@ var gPrivacyPane = {
     this.trackingProtectionReadPrefs();
     this.networkCookieBehaviorReadPrefs();
     this._initTrackingProtectionExtensionControl();
+    this._initSecurityLevel();
 
     Services.telemetry.setEventRecordingEnabled("pwmgr", true);
 
diff --git a/browser/components/preferences/in-content/privacy.xul b/browser/components/preferences/in-content/privacy.xul
index d7c91810fdff3..013fe147bc82b 100644
--- a/browser/components/preferences/in-content/privacy.xul
+++ b/browser/components/preferences/in-content/privacy.xul
@@ -870,6 +870,8 @@
   <html:h1 data-l10n-id="security-header"/>
 </hbox>
 
+#include ../../securitylevel/content/securityLevelPreferences.inc.xul
+
 <!-- addons, forgery (phishing) UI Security -->
 <groupbox id="browsingProtectionGroup" data-category="panePrivacy" hidden="true">
   <label><html:h2 data-l10n-id="security-browsing-protection"/></label>
diff --git a/browser/components/securitylevel/content/securityLevel.js b/browser/components/securitylevel/content/securityLevel.js
new file mode 100644
index 0000000000000..d77aaa4adf05c
--- /dev/null
+++ b/browser/components/securitylevel/content/securityLevel.js
@@ -0,0 +1,528 @@
+"use strict";
+
+ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
+ChromeUtils.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetters(this, {
+  CustomizableUI: "resource:///modules/CustomizableUI.jsm",
+  PanelMultiView: "resource:///modules/PanelMultiView.jsm",
+});
+
+/*
+ Security Level Strings
+
+ Strings loaded from torbutton, but en-US defaults provided in case torbutton addon not enabled
+*/
+XPCOMUtils.defineLazyGetter(this, "SecurityLevelStrings", function() {
+  let sls = null;
+  try {
+    sls = Services.strings.createBundle("chrome://torbutton/locale/securityLevel.properties");
+  } catch(e) { }
+
+  // tries to get the given key from the string bundle, return fallback on failure
+  let getString = function(key, fallback) {
+    let retval = "";
+    if (sls) {
+      try {
+        retval = sls.GetStringFromName(key);
+      } catch(e) { }
+    }
+    if (retval == "") {
+      retval = fallback;
+    }
+    return retval;
+  };
+
+  // read localized strings from torbutton; but use hard-coded en-US strings as fallbacks in case of error
+  let retval = {
+    securityLevel : getString("securityLevel.securityLevel", "Security Level"),
+    customWarning : getString("securityLevel.customWarning", "Custom"),
+    overview : getString("securityLevel.overview", "Disable certain web features that can be used to attack your security and anonymity."),
+    standard : {
+      level : getString("securityLevel.standard.level", "Standard"),
+      tooltip : getString("securityLevel.standard.tooltip", "Security Level : Standard"),
+      summary : getString("securityLevel.standard.summary", "All Tor Browser and website features are enabled."),
+    },
+    safer : {
+      level : getString("securityLevel.safer.level", "Safer"),
+      tooltip : getString("securityLevel.safer.tooltip", "Security Level : Safer"),
+      summary : getString("securityLevel.safer.summary", "Disables website features that are often dangerous, causing some sites to lose functionality."),
+      description1 : getString("securityLevel.safer.description1", "JavaScript is disabled on non-HTTPS sites."),
+      description2 : getString("securityLevel.safer.description2", "Some fonts and math symbols are disabled."),
+      description3 : getString("securityLevel.safer.description3", "Audio and video (HTML5 media) are click-to-play."),
+    },
+    safest : {
+      level : getString("securityLevel.safest.level", "Safest"),
+      tooltip : getString("securityLevel.safest.tooltip", "Security Level : Safest"),
+      summary : getString("securityLevel.safest.summary", "Only allows website features required for static sites and basic services. These changes affect images, media, and scripts."),
+      description1 : getString("securityLevel.safest.description1", "JavaScript is disabled by default on all sites."),
+      description2 : getString("securityLevel.safest.description2", "Some fonts, icons, math symbols, and images are disabled."),
+      description3 : getString("securityLevel.safest.description3", "Audio and video (HTML5 media) are click-to-play."),
+    },
+    custom : {
+      summary : getString("securityLevel.custom.summary", "Your custom browser preferences have resulted in unusual security settings. For security and privacy reasons, we recommend you choose one of the default security levels."),
+    },
+    learnMore : getString("securityLevel.learnMore", "Learn more"),
+    learnMoreURL : function() {
+        let locale = "";
+        try {
+          let { getLocale } =
+            Cu.import("resource://torbutton/modules/utils.js", {});
+          locale = getLocale();
+        } catch(e) {}
+
+        if (locale == "") {
+          locale = "en-US";
+        }
+
+        return "https://tb-manual.torproject.org/" + locale + "/security-settings/";
+      }(),
+    restoreDefaults : getString("securityLevel.restoreDefaults", "Restore Defaults"),
+    advancedSecuritySettings : getString("securityLevel.advancedSecuritySettings", "Advanced Security Settings\u2026"),
+  };
+
+
+  return retval;
+});
+
+
+/*
+  Security Level Prefs
+
+  Getters and Setters for relevant torbutton prefs
+*/
+const SecurityLevelPrefs = {
+  security_slider_pref : "extensions.torbutton.security_slider",
+  security_custom_pref : "extensions.torbutton.security_custom",
+
+  get securitySlider() {
+    try {
+      return Services.prefs.getIntPref(this.security_slider_pref);
+    } catch(e) {
+      // init pref to 4 (standard)
+      const val = 4;
+      Services.prefs.setIntPref(this.security_slider_pref, val);
+      return val;
+    }
+  },
+
+  set securitySlider(val) {
+    Services.prefs.setIntPref(this.security_slider_pref, val);
+  },
+
+  get securityCustom() {
+    try {
+      return Services.prefs.getBoolPref(this.security_custom_pref);
+    } catch(e) {
+      // init custom to false
+      const val = false;
+      Services.prefs.setBoolPref(this.security_custom_pref, val);
+      return val;
+    }
+  },
+
+  set securityCustom(val) {
+    Services.prefs.setBoolPref(this.security_custom_pref, val);
+  },
+};
+
+/*
+  Security Level Button Code
+
+  Controls init and update of the security level toolbar button
+*/
+
+const SecurityLevelButton = {
+  _securityPrefsBranch : null,
+
+  _populateXUL : function(securityLevelButton) {
+    if (securityLevelButton != null) {
+      securityLevelButton.setAttribute("tooltiptext", SecurityLevelStrings.securityLevel);
+      securityLevelButton.setAttribute("label", SecurityLevelStrings.securityLevel);
+    }
+  },
+
+  _configUIFromPrefs : function(securityLevelButton) {
+    if (securityLevelButton != null) {
+      let securitySlider = SecurityLevelPrefs.securitySlider;
+      let classList = securityLevelButton.classList;
+      classList.remove("standard", "safer", "safest");
+      switch(securitySlider) {
+        case 4:
+          classList.add("standard");
+          securityLevelButton.setAttribute("tooltiptext", SecurityLevelStrings.standard.tooltip);
+          break;
+        case 2:
+          classList.add("safer");
+          securityLevelButton.setAttribute("tooltiptext", SecurityLevelStrings.safer.tooltip);
+          break;
+        case 1:
+          classList.add("safest");
+          securityLevelButton.setAttribute("tooltiptext", SecurityLevelStrings.safest.tooltip);
+          break;
+      }
+    }
+  },
+
+  init : function() {
+    // set the initial class based off of the current pref
+    let button = document.getElementById("security-level-button");
+    this._populateXUL(button);
+    this._configUIFromPrefs(button);
+
+    this._securityPrefsBranch = Services.prefs.getBranch("extensions.torbutton.");
+    this._securityPrefsBranch.addObserver("", this, false);
+
+    CustomizableUI.addListener(this);
+
+    SecurityLevelPanel.init();
+  },
+
+  uninit : function() {
+    CustomizableUI.removeListener(this);
+
+    this._securityPrefsBranch.removeObserver("", this);
+    this._securityPrefsBranch = null;
+
+    SecurityLevelPanel.uninit();
+  },
+
+  observe : function(subject, topic, data) {
+    switch(topic) {
+      case "nsPref:changed":
+        if (data == "security_slider") {
+          this._configUIFromPrefs(document.getElementById("security-level-button"));
+        }
+        break;
+    }
+  },
+
+  // callbacks for entering the 'Customize Firefox' screen to set icon
+  onCustomizeStart : function(window) {
+    let navigatorToolbox = document.getElementById("navigator-toolbox");
+    let button = navigatorToolbox.palette.querySelector("#security-level-button");
+    this._populateXUL(button);
+    this._configUIFromPrefs(button);
+  },
+
+  // callback when CustomizableUI modifies DOM
+  onWidgetAfterDOMChange : function(aNode, aNextNode, aContainer, aWasRemoval) {
+    if (aNode.id == "security-level-button" && !aWasRemoval) {
+      this._populateXUL(aNode);
+      this._configUIFromPrefs(aNode);
+    }
+  },
+
+  // when toolbar button is pressed
+  onCommand : function(anchor, event) {
+    SecurityLevelPanel.show(anchor);
+  },
+};
+
+/*
+  Security Level Panel Code
+
+  Controls init and update of the panel in the security level hanger
+*/
+
+const SecurityLevelPanel = {
+  _securityPrefsBranch : null,
+  _panel : null,
+  _anchor : null,
+  _populated : false,
+
+  _populateXUL : function() {
+    // get the panel elements we need to populate
+    let panelview = document.getElementById("securityLevel-panelview");
+    let labelHeader = panelview.querySelector("#securityLevel-header");
+    let labelCustomWarning = panelview.querySelector("#securityLevel-customWarning")
+    let labelLearnMore = panelview.querySelector("#securityLevel-learnMore");
+    let buttonRestoreDefaults = panelview.querySelector("#securityLevel-restoreDefaults");
+    let buttonAdvancedSecuritySettings = panelview.querySelector("#securityLevel-advancedSecuritySettings");
+
+    labelHeader.setAttribute("value", SecurityLevelStrings.securityLevel);
+    labelCustomWarning.setAttribute("value", SecurityLevelStrings.customWarning);
+    labelLearnMore.setAttribute("value", SecurityLevelStrings.learnMore);
+    labelLearnMore.setAttribute("href", SecurityLevelStrings.learnMoreURL);
+    buttonRestoreDefaults.setAttribute("label", SecurityLevelStrings.restoreDefaults);
+    buttonAdvancedSecuritySettings.setAttribute("label", SecurityLevelStrings.advancedSecuritySettings);
+
+    // rest of the XUL is set based on security prefs
+    this._configUIFromPrefs();
+
+    this._populated = true;
+  },
+
+  _configUIFromPrefs : function() {
+    // get security prefs
+    let securitySlider = SecurityLevelPrefs.securitySlider;
+    let securityCustom = SecurityLevelPrefs.securityCustom;
+
+    // get the panel elements we need to populate
+    let panelview = document.getElementById("securityLevel-panelview");
+    let labelLevel = panelview.querySelector("#securityLevel-level");
+    let labelCustomWarning = panelview.querySelector("#securityLevel-customWarning")
+    let summary = panelview.querySelector("#securityLevel-summary");
+    let buttonRestoreDefaults = panelview.querySelector("#securityLevel-restoreDefaults");
+    let buttonAdvancedSecuritySettings = panelview.querySelector("#securityLevel-advancedSecuritySettings");
+
+    // only visible when user is using custom settings
+    labelCustomWarning.hidden = !securityCustom;
+    buttonRestoreDefaults.hidden = !securityCustom;
+
+    // Descriptions change based on security level
+    switch(securitySlider) {
+      // standard
+      case 4:
+        labelLevel.setAttribute("value", SecurityLevelStrings.standard.level);
+        summary.textContent = SecurityLevelStrings.standard.summary;
+        break;
+      // safer
+      case 2:
+        labelLevel.setAttribute("value", SecurityLevelStrings.safer.level);
+        summary.textContent = SecurityLevelStrings.safer.summary;
+        break;
+      // safest
+      case 1:
+        labelLevel.setAttribute("value", SecurityLevelStrings.safest.level);
+        summary.textContent = SecurityLevelStrings.safest.summary;
+        break;
+    }
+
+    // override the summary text with custom warning
+    if (securityCustom) {
+      summary.textContent = SecurityLevelStrings.custom.summary;
+    }
+  },
+
+  init : function() {
+    this._securityPrefsBranch = Services.prefs.getBranch("extensions.torbutton.");
+    this._securityPrefsBranch.addObserver("", this, false);
+  },
+
+  uninit : function() {
+    this._securityPrefsBranch.removeObserver("", this);
+    this._securityPrefsBranch = null;
+  },
+
+  show : function(anchor) {
+    // we have to defer this until after the browser has finished init'ing before
+    // we can populate the panel
+    if (!this._populated) {
+      this._populateXUL();
+    }
+
+    // save off anchor in case we want to show from our own code
+    this._anchor = anchor;
+
+    let panel = document.getElementById("securityLevel-panel");
+    panel.hidden = false;
+    PanelMultiView.openPopup(panel, anchor, "bottomcenter topright",
+                             0, 0, false, null).catch(Cu.reportError);
+  },
+
+  hide : function() {
+    let panel = document.getElementById("securityLevel-panel");
+    PanelMultiView.hidePopup(panel);
+  },
+
+  // when prefs change
+  observe : function(subject, topic, data) {
+    switch(topic) {
+      case "nsPref:changed":
+        if (data == "security_slider" || data == "security_custom") {
+          this._configUIFromPrefs();
+        }
+        break;
+    }
+  },
+
+  restoreDefaults : function() {
+    SecurityLevelPrefs.securityCustom = false;
+    // hide and reshow so that layout re-renders properly
+    this.hide();
+    this.show(this._anchor);
+  },
+
+  openAdvancedSecuritySettings : async function() {
+    openPreferences("privacy-securitylevel");
+    this.hide();
+  }
+};
+
+/*
+  Security Level Preferences Code
+
+  Code to handle init and update of security level section in about:preferences#privacy
+*/
+
+const SecurityLevelPreferences =
+{
+  _securityPrefsBranch : null,
+
+  _populateXUL : function() {
+    let groupbox = document.getElementById("securityLevel-groupbox");
+
+    let labelHeader = groupbox.querySelector("#securityLevel-header");
+    labelHeader.textContent = TorStrings.securityLevel.securityLevel;
+
+    let spanOverview = groupbox.querySelector("#securityLevel-overview");
+    spanOverview.textContent = SecurityLevelStrings.overview;
+
+    let labelLearnMore = groupbox.querySelector("#securityLevel-learnMore");
+    labelLearnMore.setAttribute("value", SecurityLevelStrings.learnMore);
+    labelLearnMore.setAttribute("href", SecurityLevelStrings.learnMoreURL);
+
+    let populateRadioElements = function(vboxQuery, stringStruct) {
+      let vbox = groupbox.querySelector(vboxQuery);
+
+      let radio = vbox.querySelector("radio");
+      radio.setAttribute("label", stringStruct.level);
+
+      let customWarning = vbox.querySelector("#securityLevel-customWarning");
+      customWarning.setAttribute("value", SecurityLevelStrings.customWarning);
+
+      let labelSummary = vbox.querySelector("#securityLevel-summary");
+      labelSummary.textContent = stringStruct.summary;
+
+      let labelRestoreDefaults = vbox.querySelector("#securityLevel-restoreDefaults");
+      labelRestoreDefaults.setAttribute("value", SecurityLevelStrings.restoreDefaults);
+
+      let description1 = vbox.querySelector("#securityLevel-description1");
+      if (description1) {
+        description1.textContent = stringStruct.description1;
+      }
+      let description2 = vbox.querySelector("#securityLevel-description2");
+      if (description2) {
+        description2.textContent = stringStruct.description2;
+      }
+      let description3 = vbox.querySelector("#securityLevel-description3");
+      if (description3) {
+        description3.textContent = stringStruct.description3;
+      }
+    };
+
+    populateRadioElements("#securityLevel-vbox-standard", SecurityLevelStrings.standard);
+    populateRadioElements("#securityLevel-vbox-safer", SecurityLevelStrings.safer);
+    populateRadioElements("#securityLevel-vbox-safest", SecurityLevelStrings.safest);
+  },
+
+  _configUIFromPrefs : function() {
+    // read our prefs
+    let securitySlider = SecurityLevelPrefs.securitySlider;
+    let securityCustom = SecurityLevelPrefs.securityCustom;
+
+    // get our elements
+    let groupbox = document.getElementById("securityLevel-groupbox");
+
+    let radiogroup =  groupbox.querySelector("#securityLevel-radiogroup");
+    let labelStandardCustom = groupbox.querySelector("#securityLevel-vbox-standard label#securityLevel-customWarning");
+    let labelSaferCustom = groupbox.querySelector("#securityLevel-vbox-safer label#securityLevel-customWarning");
+    let labelSafestCustom = groupbox.querySelector("#securityLevel-vbox-safest label#securityLevel-customWarning");
+    let labelStandardRestoreDefaults = groupbox.querySelector("#securityLevel-vbox-standard label#securityLevel-restoreDefaults");
+    let labelSaferRestoreDefaults = groupbox.querySelector("#securityLevel-vbox-safer label#securityLevel-restoreDefaults");
+    let labelSafestRestoreDefaults = groupbox.querySelector("#securityLevel-vbox-safest label#securityLevel-restoreDefaults");
+
+    // hide custom label by default until we know which level we're at
+    labelStandardCustom.hidden = true;
+    labelSaferCustom.hidden = true;
+    labelSafestCustom.hidden = true;
+
+    labelStandardRestoreDefaults.hidden = true;
+    labelSaferRestoreDefaults.hidden = true;
+    labelSafestRestoreDefaults.hidden = true;
+
+    switch(securitySlider) {
+      // standard
+      case 4:
+        radiogroup.value = "standard";
+        labelStandardCustom.hidden = !securityCustom;
+        labelStandardRestoreDefaults.hidden = !securityCustom;
+        break;
+      // safer
+      case 2:
+        radiogroup.value = "safer";
+        labelSaferCustom.hidden = !securityCustom;
+        labelSaferRestoreDefaults.hidden = !securityCustom;
+        break;
+      // safest
+      case 1:
+        radiogroup.value = "safest";
+        labelSafestCustom.hidden = !securityCustom;
+        labelSafestRestoreDefaults.hidden = !securityCustom;
+        break;
+    }
+  },
+
+  init : function() {
+    // populate XUL with localized strings
+    this._populateXUL();
+
+    // read prefs and populate UI
+    this._configUIFromPrefs();
+
+    // register for pref chagnes
+    this._securityPrefsBranch = Services.prefs.getBranch("extensions.torbutton.");
+    this._securityPrefsBranch.addObserver("", this, false);
+  },
+
+  uninit : function() {
+    // unregister for pref change events
+    this._securityPrefsBranch.removeObserver("", this);
+    this._securityPrefsBranch = null;
+  },
+
+  // callback for when prefs change
+  observe : function(subject, topic, data) {
+    switch(topic) {
+      case "nsPref:changed":
+        if (data == "security_slider" ||
+            data == "security_custom") {
+          this._configUIFromPrefs();
+        }
+        break;
+    }
+  },
+
+  selectSecurityLevel : function() {
+    // radio group elements
+    let radiogroup =  document.getElementById("securityLevel-radiogroup");
+
+    // update pref based on selected radio option
+    switch (radiogroup.value) {
+      case "standard":
+        SecurityLevelPrefs.securitySlider = 4;
+        break;
+      case "safer":
+        SecurityLevelPrefs.securitySlider = 2;
+        break;
+      case "safest":
+        SecurityLevelPrefs.securitySlider = 1;
+        break;
+    }
+
+    this.restoreDefaults();
+  },
+
+  restoreDefaults : function() {
+    SecurityLevelPrefs.securityCustom = false;
+  },
+};
+
+Object.defineProperty(this, "SecurityLevelButton", {
+  value: SecurityLevelButton,
+  enumerable: true,
+  writable: false
+});
+
+Object.defineProperty(this, "SecurityLevelPanel", {
+  value: SecurityLevelPanel,
+  enumerable: true,
+  writable: false
+});
+
+Object.defineProperty(this, "SecurityLevelPreferences", {
+  value: SecurityLevelPreferences,
+  enumerable: true,
+  writable: false
+});
diff --git a/browser/components/securitylevel/content/securityLevelButton.css b/browser/components/securitylevel/content/securityLevelButton.css
new file mode 100644
index 0000000000000..81f2365bae289
--- /dev/null
+++ b/browser/components/securitylevel/content/securityLevelButton.css
@@ -0,0 +1,9 @@
+toolbarbutton#security-level-button.standard {
+  list-style-image: url("chrome://browser/content/securitylevel/securityLevelButton.svg#standard");
+}
+toolbarbutton#security-level-button.safer {
+  list-style-image: url("chrome://browser/content/securitylevel/securityLevelButton.svg#safer");
+}
+toolbarbutton#security-level-button.safest {
+  list-style-image: url("chrome://browser/content/securitylevel/securityLevelButton.svg#safest");
+}
diff --git a/browser/components/securitylevel/content/securityLevelButton.inc.xul b/browser/components/securitylevel/content/securityLevelButton.inc.xul
new file mode 100644
index 0000000000000..4ad26f4142bd6
--- /dev/null
+++ b/browser/components/securitylevel/content/securityLevelButton.inc.xul
@@ -0,0 +1,5 @@
+<toolbarbutton id="security-level-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
+               removable="true"
+               oncommand="SecurityLevelButton.onCommand(this, event);"
+               closemenu="none"
+               cui-areatype="toolbar"/>
diff --git a/browser/components/securitylevel/content/securityLevelButton.svg b/browser/components/securitylevel/content/securityLevelButton.svg
new file mode 100644
index 0000000000000..8535cdcc531e8
--- /dev/null
+++ b/browser/components/securitylevel/content/securityLevelButton.svg
@@ -0,0 +1,21 @@
+<svg width="14px" height="16px" viewBox="0 0 14 16" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <style>
+    use:not(:target) {
+      display: none;
+    }
+  </style>
+  <defs>
+    <g id="standard_icon" stroke="none" stroke-width="1">
+      <path d="M7.0 2.16583509C7.0 2.16583509 2.0 4.24375717 2.0 4.24375717C2.0 4.24375717 2.0 7.27272727 2.0 7.27272727C2.0 10.2413541 4.13435329 13.0576771 7.0 13.9315843C9.8656467 13.0576771 12.0 10.2413541 12.0 7.27272727C12.0 7.27272727 12.0 4.24375717 12.0 4.24375717C12.0 4.24375717 7.0 2.16583509 7.0 2.16583509C7.0 2.16583509 7.0 2.16583509 7.0 2.16583509M7.0 0.0C7.0 0.0 14.0 2.90909091 14.0 2.90909091C14.0 2.90909091 14.0 7.27272727 14.0 7.27272727C14.0 11.3090909 11.0133333 15.0836364 7.0 16.0C2.98666667 15.0836364 0.0 11.3090909 0.0 7.27272727C0.0 7.27272727 0.0 2.90909091 0.0 2.90909091C0.0 2.90909091 7.0 0.0 7.0 0.0C7.0 0.0 7.0 0.0 7.0 0.0" />
+    </g>
+    <g id="safer_icon" stroke="none" stroke-width="1">
+      <path fill-rule="nonzero" d="M7.0 2.1658351C7.0 13.931584 7.0 2.1658351 7.0 13.931584C9.8656467 13.057677 12.0 10.241354 12.0 7.2727273C12.0 7.2727273 12.0 4.2437572 12.0 4.2437572C12.0 4.2437572 7.0 2.1658351 7.0 2.1658351C7.0 2.1658351 7.0 2.1658351 7.0 2.1658351M7.0 0.0C7.0 0.0 14.0 2.9090909 14.0 2.9090909C14.0 2.9090909 14.0 7.2727273 14.0 7.2727273C14.0 11.309091 11.013333 15.083636 7.0 16.0C2.9866667 15.083636 0.0 11.309091 0.0 7.2727273C0.0 7.2727273 0.0 2.9090909 0.0 2.9090909C0.0 2.9090909 7.0 0.0 7.0 0.0"/>
+    </g>
+    <g id="safest_icon" stroke="none" stroke-width="1">
+      <path d="M7.0 0.0C7.0 0.0 14.0 2.90909091 14.0 2.90909091C14.0 2.90909091 14.0 7.27272727 14.0 7.27272727C14.0 11.3090909 11.0133333 15.0836364 7.0 16.0C2.98666667 15.0836364 0.0 11.3090909 0.0 7.27272727C0.0 7.27272727 0.0 2.90909091 0.0 2.90909091C0.0 2.90909091 7.0 0.0 7.0 0.0C7.0 0.0 7.0 0.0 7.0 0.0" />
+    </g>
+  </defs>
+  <use id="standard" fill="context-fill" fill-opacity="context-fill-opacity" href="#standard_icon" />
+  <use id="safer" fill="context-fill" fill-opacity="context-fill-opacity" href="#safer_icon" />
+  <use id="safest" fill="context-fill" fill-opacity="context-fill-opacity" href="#safest_icon" />
+</svg>
diff --git a/browser/components/securitylevel/content/securityLevelPanel.css b/browser/components/securitylevel/content/securityLevelPanel.css
new file mode 100644
index 0000000000000..170bf625ea1d9
--- /dev/null
+++ b/browser/components/securitylevel/content/securityLevelPanel.css
@@ -0,0 +1,82 @@
+/* Security Level CSS */
+
+panel#securityLevel-panel > .panel-arrowcontainer > .panel-arrowcontent {
+  padding: 0;
+}
+
+panelview#securityLevel-panelview {
+  width: 20em;
+}
+
+panelview#securityLevel-panelview>vbox.panel-subview-body {
+  padding: 1em;
+}
+
+label#securityLevel-header {
+  text-transform: uppercase;
+  color: GrayText;
+  font-size: 0.85em;
+  margin: 0 0 0.4em 0;
+  padding: 0;
+}
+
+hbox#securityLevel-levelHbox {
+  margin-bottom: 1em;
+}
+
+label#securityLevel-level {
+  font-size: 1.5em;
+  margin: 0 0.5em 0 0;
+  padding: 0;
+}
+
+label#securityLevel-customWarning {
+  border-radius: 2px;
+  background-color: #ffe845;
+  text-transform: uppercase;
+  font-weight: bolder;
+  font-size: 0.8em;
+  height: 1em;
+  line-height: 1em;
+  vertical-align: middle;
+  margin: auto;
+  padding: 0.4em;
+}
+
+panelview#securityLevel-panelview description {
+  margin: 0 -0.5em 0.5em 0;
+  padding: 0 !important;
+}
+
+label#securityLevel-learnMore {
+  margin: 0 0 1.0em 0;
+  padding: 0;
+}
+
+panelview#securityLevel-panelview button {
+  -moz-appearance: none;
+  background-color: var(--arrowpanel-dimmed);
+}
+
+panelview#securityLevel-panelview button:hover {
+  background-color: var(--arrowpanel-dimmed-further);
+}
+
+panelview#securityLevel-panelview button:active {
+  background-color: var(--arrowpanel-dimmed-even-further);
+}
+
+button#securityLevel-restoreDefaults {
+  margin: 0 0 1.0em 0;
+  padding: 0.45em;
+  color: inherit !important;
+}
+
+button#securityLevel-advancedSecuritySettings {
+  margin: 0 -1.0em -1.0em -1.0em;
+  border-radius: 0;
+  border-top: 1px solid var(--panel-separator-color);
+  padding: 0;
+  height: 3.0em;
+  color: inherit !important;
+}
diff --git a/browser/components/securitylevel/content/securityLevelPanel.inc.xul b/browser/components/securitylevel/content/securityLevelPanel.inc.xul
new file mode 100644
index 0000000000000..532e8dd98b322
--- /dev/null
+++ b/browser/components/securitylevel/content/securityLevelPanel.inc.xul
@@ -0,0 +1,33 @@
+<panel id="securityLevel-panel"
+   role="group"
+   type="arrow"
+   orient="vertical"
+   level="top"
+   hidden="true">
+  <panelmultiview mainViewId="securityLevel-panelview">
+    <panelview id="securityLevel-panelview" descriptionheightworkaround="true">
+      <vbox class="panel-subview-body">
+        <label id="securityLevel-header"/>
+        <hbox id="securityLevel-levelHbox">
+          <label id="securityLevel-level"/>
+          <vbox>
+            <spacer flex="1"/>
+              <label id="securityLevel-customWarning"/>
+            <spacer flex="1"/>
+          </vbox>
+        </hbox>
+        <description id="securityLevel-summary"/>
+        <label
+          id="securityLevel-learnMore"
+          class="learnMore text-link"
+          onclick="SecurityLevelPanel.hide();"/>
+        <button
+          id="securityLevel-restoreDefaults"
+          oncommand="SecurityLevelPanel.restoreDefaults();"/>
+        <button
+          id="securityLevel-advancedSecuritySettings"
+          oncommand="SecurityLevelPanel.openAdvancedSecuritySettings();"/>
+      </vbox>
+    </panelview>
+  </panelmultiview>
+</panel>
diff --git a/browser/components/securitylevel/content/securityLevelPreferences.css b/browser/components/securitylevel/content/securityLevelPreferences.css
new file mode 100644
index 0000000000000..0d1040d177d8c
--- /dev/null
+++ b/browser/components/securitylevel/content/securityLevelPreferences.css
@@ -0,0 +1,26 @@
+label#securityLevel-customWarning {
+  border-radius: 2px;
+  background-color: #ffe845;
+  text-transform: uppercase;
+  font-weight: bolder;
+  font-size: 0.7em;
+  height: 1em;
+  line-height: 1em;
+  padding: 0.35em;
+}
+
+radiogroup#securityLevel-radiogroup radio {
+  font-weight: bold;
+}
+
+vbox#securityLevel-vbox-standard,
+vbox#securityLevel-vbox-safer,
+vbox#securityLevel-vbox-safest {
+  margin-top: 0.4em;
+}
+
+vbox#securityLevel-vbox-standard description.indent,
+vbox#securityLevel-vbox-safer description.indent,
+vbox#securityLevel-vbox-safest description.indent {
+  margin-inline-start: 0 !important;
+}
diff --git a/browser/components/securitylevel/content/securityLevelPreferences.inc.xul b/browser/components/securitylevel/content/securityLevelPreferences.inc.xul
new file mode 100644
index 0000000000000..5e38bff474ee4
--- /dev/null
+++ b/browser/components/securitylevel/content/securityLevelPreferences.inc.xul
@@ -0,0 +1,66 @@
+<groupbox id="securityLevel-groupbox" data-category="panePrivacy" hidden="true">
+  <label><html:h2 id="securityLevel-header"/></label>
+  <vbox data-subcategory="securitylevel" flex="1">
+    <description flex="1">
+      <html:span id="securityLevel-overview" class="tail-with-learn-more"/>
+      <label id="securityLevel-learnMore" class="learnMore text-link"/>
+    </description>
+    <radiogroup id="securityLevel-radiogroup"
+                oncommand="SecurityLevelPreferences.selectSecurityLevel();">
+      <vbox id="securityLevel-vbox-standard">
+        <hbox>
+          <radio value="standard"/>
+          <vbox>
+            <spacer flex="1"/>
+            <label id="securityLevel-customWarning"/>
+            <spacer flex="1"/>
+          </vbox>
+        </hbox>
+        <description flex="1">
+          <html:span id="securityLevel-summary" class="tail-with-learn-more"/>
+          <label id="securityLevel-restoreDefaults"
+                 class="learnMore text-link"
+                 onclick="SecurityLevelPreferences.restoreDefaults();"/>
+        </description>
+      </vbox>
+      <vbox id="securityLevel-vbox-safer">
+        <hbox>
+          <radio value="safer"/>
+          <vbox>
+            <spacer flex="1"/>
+            <label id="securityLevel-customWarning"/>
+            <spacer flex="1"/>
+          </vbox>
+        </hbox>
+        <description flex="1">
+          <html:span id="securityLevel-summary" class="tail-with-learn-more"/>
+          <label id="securityLevel-restoreDefaults"
+                 class="learnMore text-link"
+                 onclick="SecurityLevelPreferences.restoreDefaults();"/>
+        </description>
+        <description id="securityLevel-description1" class="indent tip-caption"/>
+        <description id="securityLevel-description2" class="indent tip-caption"/>
+        <description id="securityLevel-description3" class="indent tip-caption"/>
+      </vbox>
+      <vbox id="securityLevel-vbox-safest">
+        <hbox>
+          <radio value="safest"/>
+          <vbox>
+            <spacer flex="1"/>
+            <label id="securityLevel-customWarning"/>
+            <spacer flex="1"/>
+          </vbox>
+        </hbox>
+        <description flex="1">
+          <html:span id="securityLevel-summary" class="tail-with-learn-more"/>
+          <label id="securityLevel-restoreDefaults"
+                 class="learnMore text-link"
+                 onclick="SecurityLevelPreferences.restoreDefaults();"/>
+        </description>
+        <description id="securityLevel-description1" class="indent tip-caption"/>
+        <description id="securityLevel-description2" class="indent tip-caption"/>
+        <description id="securityLevel-description3" class="indent tip-caption"/>
+      </vbox>
+    </radiogroup>
+  </vbox>
+</groupbox>
diff --git a/browser/components/securitylevel/jar.mn b/browser/components/securitylevel/jar.mn
new file mode 100644
index 0000000000000..9ac408083fbc9
--- /dev/null
+++ b/browser/components/securitylevel/jar.mn
@@ -0,0 +1,6 @@
+browser.jar:
+    content/browser/securitylevel/securityLevel.js             (content/securityLevel.js)
+    content/browser/securitylevel/securityLevelPanel.css       (content/securityLevelPanel.css)
+    content/browser/securitylevel/securityLevelButton.css      (content/securityLevelButton.css)
+    content/browser/securitylevel/securityLevelPreferences.css (content/securityLevelPreferences.css)
+    content/browser/securitylevel/securityLevelButton.svg      (content/securityLevelButton.svg)
diff --git a/browser/components/securitylevel/moz.build b/browser/components/securitylevel/moz.build
new file mode 100644
index 0000000000000..7e103239c8d67
--- /dev/null
+++ b/browser/components/securitylevel/moz.build
@@ -0,0 +1 @@
+JAR_MANIFESTS += ['jar.mn']
-- 
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