Bug 1166365 - Introduce Narrate feature in reader mode. r=Gijs
authorEitan Isaacson <eitan@monotonous.org>
Mon, 01 Feb 2016 11:09:14 -0800
changeset 286991 df591274c1d7b003034f8275f5bbf850fde8d9ce
parent 286990 e3447f8edd06bc0f13e2e201357151e5b92a02a5
child 286992 c94c22d14ce7181dcc4af8033e9b5f8c14750e7d
push id18032
push usercbook@mozilla.com
push dateMon, 07 Mar 2016 10:38:51 +0000
treeherderfx-team@087905ffec78 [default view] [failures only]
perfherder[talos] [build metrics] [platform microbench] (compared to previous push)
reviewersGijs
bugs1166365
milestone47.0a1
Bug 1166365 - Introduce Narrate feature in reader mode. r=Gijs MozReview-Commit-ID: 6tJIu7C4eAv
modules/libpref/init/all.js
toolkit/components/moz.build
toolkit/components/narrate/.eslintrc
toolkit/components/narrate/NarrateControls.jsm
toolkit/components/narrate/Narrator.jsm
toolkit/components/narrate/VoiceSelect.jsm
toolkit/components/narrate/moz.build
toolkit/components/reader/AboutReader.jsm
toolkit/locales/en-US/chrome/global/narrate.properties
toolkit/locales/jar.mn
toolkit/themes/shared/jar.inc.mn
toolkit/themes/shared/narrate.css
toolkit/themes/shared/narrate/arrow.svg
toolkit/themes/shared/narrate/back.svg
toolkit/themes/shared/narrate/fast.svg
toolkit/themes/shared/narrate/forward.svg
toolkit/themes/shared/narrate/narrate.svg
toolkit/themes/shared/narrate/slow.svg
toolkit/themes/shared/narrate/start.svg
toolkit/themes/shared/narrate/stop.svg
toolkit/themes/shared/narrateControls.css
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -5157,16 +5157,26 @@ pref("reader.font_type", "sans-serif");
 
 // Whether or not the user has interacted with the reader mode toolbar.
 // This is used to show a first-launch tip in reader mode.
 pref("reader.has_used_toolbar", false);
 
 // Whether to use a vertical or horizontal toolbar.
 pref("reader.toolbar.vertical", true);
 
+#if !defined(ANDROID)
+pref("narrate.enabled", true);
+#else
+pref("narrate.enabled", false);
+#endif
+
+pref("narrate.test", false);
+pref("narrate.rate", 0);
+pref("narrate.voice", "automatic");
+
 #if defined(XP_LINUX) && defined(MOZ_GMP_SANDBOX)
 // Whether to allow, on a Linux system that doesn't support the necessary sandboxing
 // features, loading Gecko Media Plugins unsandboxed.  However, EME CDMs will not be
 // loaded without sandboxing even if this pref is changed.
 pref("media.gmp.insecure.allow", false);
 #endif
 
 pref("dom.audiochannel.mutedByDefault", false);
--- a/toolkit/components/moz.build
+++ b/toolkit/components/moz.build
@@ -29,16 +29,17 @@ DIRS += [
     'filepicker',
     'filewatcher',
     'finalizationwitness',
     'formautofill',
     'find',
     'gfx',
     'jsdownloads',
     'lz4',
+    'narrate',
     'mediasniffer',
     'microformats',
     'osfile',
     'parentalcontrols',
     'passwordmgr',
     'perf',
     'perfmonitoring',
     'places',
new file mode 100644
--- /dev/null
+++ b/toolkit/components/narrate/.eslintrc
@@ -0,0 +1,93 @@
+{
+  "extends": [
+    "../../.eslintrc"
+  ],
+
+  "globals": {
+    "Components": true,
+    "dump": true,
+    "Iterator": true
+  },
+
+  "env": { "browser": true },
+
+  "rules": {
+    // Mozilla stuff
+    "mozilla/no-aArgs": 1,
+    "mozilla/reject-importGlobalProperties": 1,
+    "mozilla/var-only-at-top-level": 1,
+
+    "block-scoped-var": 2,
+    "brace-style": [1, "1tbs", {"allowSingleLine": false}],
+    "camelcase": 1,
+    "comma-dangle": 1,
+    "comma-spacing": [1, {"before": false, "after": true}],
+    "comma-style": [1, "last"],
+    "complexity": 1,
+    "consistent-return": 2,
+    "curly": 2,
+    "dot-location": [1, "property"],
+    "dot-notation": 2,
+    "eol-last": 2,
+    "generator-star-spacing": [1, "after"],
+    "indent": [1, 2, {"SwitchCase": 1}],
+    "key-spacing": [1, {"beforeColon": false, "afterColon": true}],
+    "max-len": [1, 80, 2, {"ignoreUrls": true}],
+    "max-nested-callbacks": [2, 3],
+    "new-cap": [2, {"capIsNew": false}],
+    "new-parens": 2,
+    "no-array-constructor": 2,
+    "no-cond-assign": 2,
+    "no-control-regex": 2,
+    "no-debugger": 2,
+    "no-delete-var": 2,
+    "no-dupe-args": 2,
+    "no-dupe-keys": 2,
+    "no-duplicate-case": 2,
+    "no-else-return": 2,
+    "no-eval": 2,
+    "no-extend-native": 2,
+    "no-extra-bind": 2,
+    "no-extra-boolean-cast": 2,
+    "no-extra-semi": 1,
+    "no-fallthrough": 2,
+    "no-inline-comments": 1,
+    "no-lonely-if": 2,
+    "no-mixed-spaces-and-tabs": 2,
+    "no-multi-spaces": 1,
+    "no-multi-str": 1,
+    "no-multiple-empty-lines": [1, {"max": 1}],
+    "no-native-reassign": 2,
+    "no-nested-ternary": 2,
+    "no-redeclare": 2,
+    "no-return-assign": 2,
+    "no-self-compare": 2,
+    "no-sequences": 2,
+    "no-shadow": 1,
+    "no-shadow-restricted-names": 2,
+    "no-spaced-func": 1,
+    "no-throw-literal": 2,
+    "no-trailing-spaces": 2,
+    "no-undef": 2,
+    "no-unneeded-ternary": 2,
+    "no-unreachable": 2,
+    "no-unused-vars": 2,
+    "no-with": 2,
+    "padded-blocks": [1, "never"],
+    "quotes": [1, "double", "avoid-escape"],
+    "semi": [1, "always"],
+    "semi-spacing": [1, {"before": false, "after": true}],
+    "space-after-keywords": [1, "always"],
+    "space-before-blocks": [1, "always"],
+    "space-before-function-paren": [1, "never"],
+    "space-in-parens": [1, "never"],
+    "space-infix-ops": [1, {"int32Hint": true}],
+    "space-return-throw-case": 1,
+    "space-unary-ops": [1, { "words": true, "nonwords": false }],
+    "spaced-comment": [1, "always"],
+    "strict": [2, "global"],
+    "use-isnan": 2,
+    "valid-typeof": 2,
+    "yoda": 2
+  }
+}
new file mode 100644
--- /dev/null
+++ b/toolkit/components/narrate/NarrateControls.jsm
@@ -0,0 +1,244 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/narrate/VoiceSelect.jsm");
+Cu.import("resource://gre/modules/narrate/Narrator.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+this.EXPORTED_SYMBOLS = ["NarrateControls"];
+
+var gStrings = Services.strings.createBundle("chrome://global/locale/narrate.properties");
+
+function NarrateControls(mm, win) {
+  this._mm = mm;
+  this._winRef = Cu.getWeakReference(win);
+
+  // Append content style sheet in document head
+  let style = win.document.createElement("link");
+  style.rel = "stylesheet";
+  style.href = "chrome://global/skin/narrate.css";
+  win.document.head.appendChild(style);
+
+  function localize(pieces, ...substitutions) {
+    let result = pieces[0];
+    for (let i = 0; i < substitutions.length; ++i) {
+      result += gStrings.GetStringFromName(substitutions[i]) + pieces[i + 1];
+    }
+    return result;
+  }
+
+  let dropdown = win.document.createElement("ul");
+  dropdown.className = "dropdown";
+  dropdown.id = "narrate-dropdown";
+  dropdown.innerHTML =
+    localize`<style scoped>
+      @import url("chrome://global/skin/narrateControls.css");
+    </style>
+    <li>
+       <button class="dropdown-toggle button"
+               id="narrate-toggle" title="${"narrate"}"></button>
+    </li>
+    <li class="dropdown-popup">
+      <div id="narrate-control" class="narrate-row">
+        <button disabled id="narrate-skip-previous"
+                title="${"back"}"></button>
+        <button id="narrate-start-stop" title="${"start"}"></button>
+        <button disabled id="narrate-skip-next"
+                title="${"forward"}"></button>
+      </div>
+      <div id="narrate-rate" class="narrate-row">
+        <input id="narrate-rate-input" value="0" title="${"speed"}"
+               step="25" max="400" min="-400" type="range">
+      </div>
+      <div id="narrate-voices" class="narrate-row"></div>
+      <div class="dropdown-arrow"></div>
+    </li>`;
+
+  this.narrator = new Narrator(win);
+
+  let selectLabel = gStrings.GetStringFromName("selectvoicelabel");
+  let comparer = win.Intl ?
+    (new Intl.Collator()).compare : (a, b) => a.localeCompare(b);
+  let options = this.narrator.getVoiceOptions().map(v => {
+    return {
+      label: this._createVoiceLabel(v),
+      value: v.voiceURI
+    };
+  }).sort((a, b) => comparer(a.label, b.label));
+  options.unshift({
+    label: gStrings.GetStringFromName("defaultvoice"),
+    value: "automatic"
+  });
+  this.voiceSelect = new VoiceSelect(win, selectLabel, options);
+  this.voiceSelect.element.addEventListener("change", this);
+  this.voiceSelect.element.id = "voice-select";
+  dropdown.querySelector("#narrate-voices").appendChild(
+    this.voiceSelect.element);
+
+  dropdown.addEventListener("click", this, true);
+
+  let rateRange = dropdown.querySelector("#narrate-rate > input");
+  rateRange.addEventListener("input", this);
+  rateRange.addEventListener("mousedown", this);
+  rateRange.addEventListener("mouseup", this);
+
+  let branch = Services.prefs.getBranch("narrate.");
+  this.voiceSelect.value = branch.getCharPref("voice");
+  // The rate is stored as an integer.
+  rateRange.value = branch.getIntPref("rate");
+
+  let tb = win.document.getElementById("reader-toolbar");
+  tb.appendChild(dropdown);
+}
+
+NarrateControls.prototype = {
+  handleEvent: function(evt) {
+    switch (evt.type) {
+      case "mousedown":
+        this._rateMousedown = true;
+        break;
+      case "mouseup":
+        this._rateMousedown = false;
+        break;
+      case "input":
+        this._onRateInput(evt);
+        break;
+      case "change":
+        this._onVoiceChange();
+        break;
+      case "click":
+        this._onButtonClick(evt);
+        break;
+    }
+  },
+
+  _onRateInput: function(evt) {
+    if (!this._rateMousedown) {
+      this._mm.sendAsyncMessage("Reader:SetIntPref",
+        { name: "narrate.rate", value: evt.target.value });
+      this.narrator.setRate(this._convertRate(evt.target.value));
+    }
+  },
+
+  _onVoiceChange: function() {
+    let voice = this.voice;
+    this._mm.sendAsyncMessage("Reader:SetCharPref",
+      { name: "narrate.voice", value: voice });
+    this.narrator.setVoice(voice);
+  },
+
+  _onButtonClick: function(evt) {
+    switch (evt.target.id) {
+      case "narrate-skip-previous":
+        this.narrator.skipPrevious();
+        break;
+      case "narrate-skip-next":
+        this.narrator.skipNext();
+        break;
+      case "narrate-start-stop":
+        if (this.narrator.speaking) {
+          this.narrator.stop();
+        } else {
+          this._updateSpeechControls(true);
+          let options = { rate: this.rate, voice: this.voice };
+          this.narrator.start(options).then(() => {
+            this._updateSpeechControls(false);
+          });
+        }
+        break;
+      case "narrate-toggle":
+        let dropdown = this._doc.getElementById("narrate-dropdown");
+        if (dropdown.classList.contains("open")) {
+          if (this.narrator.speaking) {
+            this.narrator.stop();
+          }
+
+          // We need to remove "keep-open" class here so that AboutReader
+          // closes this dropdown properly. This class is eventually removed in
+          // _updateSpeechControls which gets called after narration stops,
+          // but that happend asynchronously and is too late.
+          dropdown.classList.remove("keep-open");
+        }
+        break;
+    }
+  },
+
+  _updateSpeechControls: function(speaking) {
+    let dropdown = this._doc.getElementById("narrate-dropdown");
+    dropdown.classList.toggle("keep-open", speaking);
+
+    let startStopButton = this._doc.getElementById("narrate-start-stop");
+    startStopButton.classList.toggle("speaking", speaking);
+    startStopButton.title =
+      gStrings.GetStringFromName(speaking ? "start" : "stop");
+
+    this._doc.getElementById("narrate-skip-previous").disabled = !speaking;
+    this._doc.getElementById("narrate-skip-next").disabled = !speaking;
+  },
+
+  _createVoiceLabel: function(voice) {
+    // This is a highly imperfect method of making human-readable labels
+    // for system voices. Because each platform has a different naming scheme
+    // for voices, we use a different method for each platform.
+    switch (Services.appinfo.OS) {
+      case "WINNT":
+        // On windows the language is included in the name, so just use the name
+        return voice.name;
+      case "Linux":
+        // On Linux, the name is usually the unlocalized language name.
+        // Use a localized language name, and have the language tag in
+        // parenthisis. This is to avoid six languages called "English".
+        return gStrings.formatStringFromName("voiceLabel",
+          [this._getLanguageName(voice.lang) || voice.name, voice.lang], 2);
+      default:
+        // On Mac the language is not included in the name, find a localized
+        // language name or show the tag if none exists.
+        // This is the ideal naming scheme so it is also the "default".
+        return gStrings.formatStringFromName("voiceLabel",
+          [voice.name, this._getLanguageName(voice.lang) || voice.lang], 2);
+    }
+  },
+
+  _getLanguageName: function(lang) {
+    if (!this._langStrings) {
+      this._langStrings = Services.strings.createBundle(
+        "chrome://global/locale/languageNames.properties ");
+    }
+
+    try {
+      // language tags will be lower case ascii between 2 and 3 characters long.
+      return this._langStrings.GetStringFromName(lang.match(/^[a-z]{2,3}/)[0]);
+    } catch (e) {
+      return "";
+    }
+  },
+
+  _convertRate: function(rate) {
+    // We need to convert a relative percentage value to a fraction rate value.
+    // eg. -100 is half the speed, 100 is twice the speed in percentage,
+    // 0.5 is half the speed and 2 is twice the speed in fractions.
+    return Math.pow(Math.abs(rate / 100) + 1, rate < 0 ? -1 : 1);
+  },
+
+  get _win() {
+    return this._winRef.get();
+  },
+
+  get _doc() {
+    return this._win.document;
+  },
+
+  get rate() {
+    return this._convertRate(
+      this._doc.getElementById("narrate-rate-input").value);
+  },
+
+  get voice() {
+    return this.voiceSelect.value;
+  }
+};
new file mode 100644
--- /dev/null
+++ b/toolkit/components/narrate/Narrator.jsm
@@ -0,0 +1,219 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { interfaces: Ci, utils: Cu } = Components;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "LanguageDetector",
+  "resource:///modules/translation/LanguageDetector.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Services",
+  "resource://gre/modules/Services.jsm");
+
+this.EXPORTED_SYMBOLS = [ "Narrator" ];
+
+// Maximum time into paragraph when pressing "skip previous" will go
+// to previous paragraph and not the start of current one.
+const PREV_THRESHOLD = 2000;
+
+function Narrator(win) {
+  this._winRef = Cu.getWeakReference(win);
+  this._inTest = Services.prefs.getBoolPref("narrate.test");
+  this._speechOptions = {};
+  this._startTime = 0;
+  this._stopped = false;
+}
+
+Narrator.prototype = {
+  get _doc() {
+    return this._winRef.get().document;
+  },
+
+  get _win() {
+    return this._winRef.get();
+  },
+
+  get _voiceMap() {
+    if (!this._voiceMapInner) {
+      this._voiceMapInner = new Map();
+      for (let voice of this._win.speechSynthesis.getVoices()) {
+        this._voiceMapInner.set(voice.voiceURI, voice);
+      }
+    }
+
+    return this._voiceMapInner;
+  },
+
+  get _paragraphs() {
+    if (!this._paragraphsInner) {
+      let wu = this._win.QueryInterface(
+        Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+      let queryString = "#reader-header > *:not(style):not(:empty), " +
+        "#moz-reader-content > .page > * > *:not(style):not(:empty)";
+      // filter out zero sized paragraphs.
+      let paragraphs = Array.from(this._doc.querySelectorAll(queryString));
+      paragraphs = paragraphs.filter(p => {
+        let bb = wu.getBoundsWithoutFlushing(p);
+        return bb.width && bb.height;
+      });
+
+      this._paragraphsInner = paragraphs.map(Cu.getWeakReference);
+    }
+
+    return this._paragraphsInner;
+  },
+
+  get _timeIntoParagraph() {
+    let rv = Date.now() - this._startTime;
+    return rv;
+  },
+
+  get speaking() {
+    return this._win.speechSynthesis.speaking ||
+      this._win.speechSynthesis.pending;
+  },
+
+  _getParagraphAt: function(index) {
+    let paragraph = this._paragraphsInner[index];
+    return paragraph ? paragraph.get() : null;
+  },
+
+  _isParagraphInView: function(paragraphRef) {
+    let paragraph = paragraphRef && paragraphRef.get && paragraphRef.get();
+    if (!paragraph) {
+      return false;
+    }
+
+    let bb = paragraph.getBoundingClientRect();
+    return bb.top >= 0 && bb.top < this._win.innerHeight;
+  },
+
+  _detectLanguage: function() {
+    if (this._speechOptions.lang || this._speechOptions.voice) {
+      return Promise.resolve();
+    }
+
+    let sampleText = this._doc.getElementById(
+      "moz-reader-content").textContent.substring(0, 60 * 1024);
+    return LanguageDetector.detectLanguage(sampleText).then(result => {
+      if (result.confident) {
+        this._speechOptions.lang = result.language;
+      }
+    });
+  },
+
+  _sendTestEvent: function(eventType, detail) {
+    let win = this._win;
+    win.dispatchEvent(new win.CustomEvent(eventType,
+      { detail: Cu.cloneInto(detail, win.document) }));
+  },
+
+  _speakInner: function() {
+    this._win.speechSynthesis.cancel();
+    let paragraph = this._getParagraphAt(this._index);
+    let utterance = new this._win.SpeechSynthesisUtterance(
+      paragraph.textContent);
+    utterance.rate = this._speechOptions.rate;
+    if (this._speechOptions.voice) {
+      utterance.voice = this._speechOptions.voice;
+    } else {
+      utterance.lang = this._speechOptions.lang;
+    }
+
+    this._startTime = Date.now();
+
+    return new Promise(resolve => {
+      utterance.addEventListener("start", () => {
+        paragraph.classList.add("narrating");
+        let bb = paragraph.getBoundingClientRect();
+        if (bb.top < 0 || bb.bottom > this._win.innerHeight) {
+          paragraph.scrollIntoView({ behavior: "smooth", block: "start"});
+        }
+
+        if (this._inTest) {
+          this._sendTestEvent("paragraphstart", {
+            voice: utterance.chosenVoiceURI,
+            rate: utterance.rate,
+            paragraph: this._index
+          });
+        }
+      });
+
+      utterance.addEventListener("end", () => {
+        if (!this._win) {
+          // page got unloaded, don't do anything.
+          return;
+        }
+
+        paragraph.classList.remove("narrating");
+        this._startTime = 0;
+        if (this._inTest) {
+          this._sendTestEvent("paragraphend", {});
+        }
+
+        if (this._index + 1 >= this._paragraphs.length || this._stopped) {
+          // We reached the end of the document, or the user pressed stopped.
+          resolve();
+        } else {
+          this._index++;
+          this._speakInner().then(resolve);
+        }
+      });
+
+      this._win.speechSynthesis.speak(utterance);
+    });
+  },
+
+  getVoiceOptions: function() {
+    return Array.from(this._voiceMap.values());
+  },
+
+  start: function(speechOptions) {
+    this._speechOptions = {
+      rate: speechOptions.rate,
+      voice: this._voiceMap.get(speechOptions.voice)
+    };
+
+    this._stopped = false;
+    return this._detectLanguage().then(() => {
+      if (!this._isParagraphInView(this._paragraphs[this._index])) {
+        this._index = this._paragraphs.findIndex(
+          this._isParagraphInView.bind(this));
+      }
+
+      return this._speakInner();
+    });
+  },
+
+  stop: function() {
+    this._stopped = true;
+    this._win.speechSynthesis.cancel();
+  },
+
+  skipNext: function() {
+    this._win.speechSynthesis.cancel();
+  },
+
+  skipPrevious: function() {
+    this._index -=
+      this._index > 0 && this._timeIntoParagraph < PREV_THRESHOLD ? 2 : 1;
+    this._win.speechSynthesis.cancel();
+  },
+
+  setRate: function(rate) {
+    this._speechOptions.rate = rate;
+    /* repeat current paragraph */
+    this._index--;
+    this._win.speechSynthesis.cancel();
+  },
+
+  setVoice: function(voice) {
+    this._speechOptions.voice = this._voiceMap.get(voice);
+    /* repeat current paragraph */
+    this._index--;
+    this._win.speechSynthesis.cancel();
+  }
+};
new file mode 100644
--- /dev/null
+++ b/toolkit/components/narrate/VoiceSelect.jsm
@@ -0,0 +1,291 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const Cu = Components.utils;
+
+this.EXPORTED_SYMBOLS = ["VoiceSelect"];
+
+function VoiceSelect(win, label, options = []) {
+  this._winRef = Cu.getWeakReference(win);
+
+  let element = win.document.createElement("div");
+  element.classList.add("voiceselect");
+  element.innerHTML =
+   `<button class="select-toggle" aria-controls="voice-options">
+      <span class="label">${label}</span> <span class="current-voice"></span>
+    </button>
+    <div class="options" id="voice-options" role="listbox"></div>`;
+
+  this._elementRef = Cu.getWeakReference(element);
+
+  let button = this.selectToggle;
+  button.addEventListener("click", this);
+  button.addEventListener("keypress", this);
+
+  let listbox = this.listbox;
+  listbox.addEventListener("click", this);
+  listbox.addEventListener("mousemove", this);
+  listbox.addEventListener("keypress", this);
+  listbox.addEventListener("wheel", this, true);
+
+  win.addEventListener("resize", () => {
+    this._updateDropdownHeight();
+  });
+
+  for (let option of options) {
+    this.add(option.label, option.value);
+  }
+
+  this.selectedIndex = 0;
+}
+
+VoiceSelect.prototype = {
+  add: function(label, value) {
+    let option = this._doc.createElement("button");
+    option.dataset.value = value;
+    option.classList.add("option");
+    option.tabIndex = "-1";
+    option.setAttribute("role", "option");
+    option.textContent = label;
+    this.listbox.appendChild(option);
+  },
+
+  toggleList: function(force, focus = true) {
+    if (this.element.classList.toggle("open", force)) {
+      if (focus) {
+        (this.selected || this.options[0]).focus();
+      }
+
+      this._updateDropdownHeight(true);
+      this.listbox.setAttribute("aria-expanded", true);
+      this._win.addEventListener("focus", this, true);
+    } else {
+      if (focus) {
+        this.element.querySelector(".select-toggle").focus();
+      }
+
+      this.listbox.setAttribute("aria-expanded", false);
+      this._win.removeEventListener("focus", this, true);
+    }
+  },
+
+  handleEvent: function(evt) {
+    let target = evt.target;
+
+    switch (evt.type) {
+      case "click":
+        if (target.classList.contains("option")) {
+          if (!target.classList.contains("selected")) {
+            this.selected = target;
+          }
+
+          this.toggleList(false);
+        } else if (target.classList.contains("select-toggle")) {
+          this.toggleList();
+        }
+        break;
+
+      case "mousemove":
+        this.listbox.classList.add("hovering");
+        break;
+
+      case "keypress":
+        if (target.classList.contains("select-toggle")) {
+          if (evt.altKey) {
+            this.toggleList(true);
+          } else {
+            this._keyPressedButton(evt);
+          }
+        } else {
+          this.listbox.classList.remove("hovering");
+          this._keyPressedInBox(evt);
+        }
+        break;
+
+      case "wheel":
+        // Don't let wheel events bubble to document. It will scroll the page
+        // and close the entire narrate dialog.
+        evt.stopPropagation();
+        break;
+
+      case "focus":
+        this._win.console.log(evt);
+        if (!evt.target.closest('.options')) {
+          this.toggleList(false, false);
+        }
+        break;
+    }
+  },
+
+  _getPagedOption: function(option, up) {
+    let height = elem => elem.getBoundingClientRect().height;
+    let listboxHeight = height(this.listbox);
+
+    let next = option;
+    for (let delta = 0; delta < listboxHeight; delta += height(next)) {
+      let sibling = up ? next.previousElementSibling : next.nextElementSibling;
+      if (!sibling) {
+        break;
+      }
+
+      next = sibling;
+    }
+
+    return next;
+  },
+
+  _keyPressedButton: function(evt) {
+    if (evt.altKey && (evt.key === "ArrowUp" || evt.key === "ArrowUp")) {
+      this.toggleList(true);
+      return;
+    }
+
+    let toSelect;
+    switch (evt.key) {
+      case "PageUp":
+      case "ArrowUp":
+        toSelect = this.selected.previousElementSibling;
+        break;
+      case "PageDown":
+      case "ArrowDown":
+        toSelect = this.selected.nextElementSibling;
+        break;
+      case "Home":
+        toSelect = this.selected.parentNode.firstElementChild;
+        break;
+      case "End":
+        toSelect = this.selected.parentNode.lastElementChild;
+        break;
+    }
+
+    if (toSelect && toSelect.classList.contains("option")) {
+      evt.preventDefault();
+      this.selected = toSelect;
+    }
+  },
+
+  _keyPressedInBox: function(evt) {
+    let toFocus;
+    let cur = this._doc.activeElement;
+
+    switch (evt.key) {
+      case "ArrowUp":
+        toFocus = cur.previousElementSibling || this.listbox.lastElementChild;
+        break;
+      case "ArrowDown":
+        toFocus = cur.nextElementSibling || this.listbox.firstElementChild;
+        break;
+      case "PageUp":
+        toFocus = this._getPagedOption(cur, true);
+        break;
+      case "PageDown":
+        toFocus = this._getPagedOption(cur, false);
+        break;
+      case "Home":
+        toFocus = cur.parentNode.firstElementChild;
+        break;
+      case "End":
+        toFocus = cur.parentNode.lastElementChild;
+        break;
+      case "Escape":
+        this.toggleList(false);
+        break;
+    }
+
+    if (toFocus && toFocus.classList.contains("option")) {
+      evt.preventDefault();
+      toFocus.focus();
+    }
+  },
+
+  _select: function(option) {
+    let oldSelected = this.selected;
+    if (oldSelected) {
+      oldSelected.removeAttribute("aria-selected");
+      oldSelected.classList.remove("selected");
+    }
+
+    if (option) {
+      option.setAttribute("aria-selected", true);
+      option.classList.add("selected");
+      this.element.querySelector(".current-voice").textContent =
+        option.textContent;
+    }
+
+    let evt = this.element.ownerDocument.createEvent("Event");
+    evt.initEvent("change", true, true);
+    this.element.dispatchEvent(evt);
+  },
+
+  _updateDropdownHeight: function(now) {
+    let updateInner = () => {
+      let winHeight = this._win.innerHeight;
+      let listbox = this.listbox;
+      let listboxTop = listbox.getBoundingClientRect().top;
+      listbox.style.maxHeight = (winHeight - listboxTop - 10) + "px";
+    };
+
+    if (now) {
+      updateInner();
+    } else if (!this._pendingDropdownUpdate) {
+      this._pendingDropdownUpdate = true;
+      this._win.requestAnimationFrame(() => {
+        updateInner();
+        delete this._pendingDropdownUpdate;
+      });
+    }
+  },
+
+  get element() {
+    return this._elementRef.get();
+  },
+
+  get listbox() {
+    return this._elementRef.get().querySelector(".options");
+  },
+
+  get selectToggle() {
+    return this._elementRef.get().querySelector(".select-toggle");
+  },
+
+  get _win() {
+    return this._winRef.get();
+  },
+
+  get _doc() {
+    return this._win.document;
+  },
+
+  set selected(option) {
+    this._select(option);
+  },
+
+  get selected() {
+    return this.element.querySelector(".options > .option.selected");
+  },
+
+  get options() {
+    return this.element.querySelectorAll(".options > .option");
+  },
+
+  set selectedIndex(index) {
+    this._select(this.options[index]);
+  },
+
+  get selectedIndex() {
+    return Array.from(this.options).indexOf(this.selected);
+  },
+
+  set value(value) {
+    let option = Array.from(this.options).find(o => o.dataset.value === value);
+    this._select(option);
+  },
+
+  get value() {
+    let selected = this.selected;
+    return selected ? selected.dataset.value : "";
+  }
+};
new file mode 100644
--- /dev/null
+++ b/toolkit/components/narrate/moz.build
@@ -0,0 +1,11 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXTRA_JS_MODULES.narrate = [
+  'NarrateControls.jsm',
+  'Narrator.jsm',
+  'VoiceSelect.jsm'
+]
--- a/toolkit/components/reader/AboutReader.jsm
+++ b/toolkit/components/reader/AboutReader.jsm
@@ -10,16 +10,17 @@ this.EXPORTED_SYMBOLS = [ "AboutReader" 
 
 Cu.import("resource://gre/modules/ReaderMode.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 
 XPCOMUtils.defineLazyModuleGetter(this, "Rect", "resource://gre/modules/Geometry.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "Task", "resource://gre/modules/Task.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "UITelemetry", "resource://gre/modules/UITelemetry.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "NarrateControls", "resource://gre/modules/narrate/NarrateControls.jsm");
 
 var gStrings = Services.strings.createBundle("chrome://global/locale/aboutReader.properties");
 
 var AboutReader = function(mm, win, articlePromise) {
   let url = this._getOriginalUrl(win);
   if (!(url.startsWith("http://") || url.startsWith("https://"))) {
     let errorMsg = "Only http:// and https:// URLs can be loaded in about:reader.";
     if (Services.prefs.getBoolPref("reader.errors.includeURLs"))
@@ -97,16 +98,20 @@ var AboutReader = function(mm, win, arti
   ];
 
   let fontType = Services.prefs.getCharPref("reader.font_type");
   this._setupSegmentedButton("font-type-buttons", fontTypeOptions, fontType, this._setFontType.bind(this));
   this._setFontType(fontType);
 
   this._setupFontSizeButtons();
 
+  if (win.speechSynthesis && Services.prefs.getBoolPref("narrate.enabled")) {
+    new NarrateControls(mm, win);
+  }
+
   this._loadArticle();
 }
 
 AboutReader.prototype = {
   _BLOCK_IMAGES_SELECTOR: ".content p > img:only-child, " +
                           ".content p > a:only-child > img:only-child, " +
                           ".content .wp-caption img, " +
                           ".content figure img",
new file mode 100644
--- /dev/null
+++ b/toolkit/locales/en-US/chrome/global/narrate.properties
@@ -0,0 +1,19 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Narrate, meaning "read the page out loud". This is the name of the feature
+# and it is the label for the popup button.
+narrate = Narrate
+back = Back
+start = Start
+stop = Stop
+forward = Forward
+speed = Speed
+selectvoicelabel = Voice:
+# Default voice is determined by the language of the document.
+defaultvoice = Default
+
+# Voice name and language.
+# eg. David (English)
+voiceLabel = %S (%S)
\ No newline at end of file
--- a/toolkit/locales/jar.mn
+++ b/toolkit/locales/jar.mn
@@ -57,16 +57,17 @@
 #endif
   locale/@AB_CD@/global/globalKeys.dtd                  (%chrome/global/globalKeys.dtd)
   locale/@AB_CD@/global/headsUpDisplay.properties       (%chrome/global/headsUpDisplay.properties)
   locale/@AB_CD@/global/intl.css                        (%chrome/global/intl.css)
   locale/@AB_CD@/global/intl.properties                 (%chrome/global/intl.properties)
   locale/@AB_CD@/global/keys.properties                 (%chrome/global/keys.properties)
   locale/@AB_CD@/global/languageNames.properties        (%chrome/global/languageNames.properties)
   locale/@AB_CD@/global/mozilla.dtd                     (%chrome/global/mozilla.dtd)
+  locale/@AB_CD@/global/narrate.properties              (%chrome/global/narrate.properties)
   locale/@AB_CD@/global/notification.dtd                (%chrome/global/notification.dtd)
   locale/@AB_CD@/global/preferences.dtd                 (%chrome/global/preferences.dtd)
   locale/@AB_CD@/global/printdialog.dtd                 (%chrome/global/printdialog.dtd)
   locale/@AB_CD@/global/printjoboptions.dtd             (%chrome/global/printjoboptions.dtd)
   locale/@AB_CD@/global/printPageSetup.dtd              (%chrome/global/printPageSetup.dtd)
   locale/@AB_CD@/global/printPreview.dtd                (%chrome/global/printPreview.dtd)
   locale/@AB_CD@/global/printPreviewProgress.dtd        (%chrome/global/printPreviewProgress.dtd)
   locale/@AB_CD@/global/printdialog.properties          (%chrome/global/printdialog.properties)
--- a/toolkit/themes/shared/jar.inc.mn
+++ b/toolkit/themes/shared/jar.inc.mn
@@ -21,16 +21,26 @@ toolkit.jar:
   skin/classic/global/aboutSupport.css                     (../../shared/aboutSupport.css)
   skin/classic/global/appPicker.css                        (../../shared/appPicker.css)
   skin/classic/global/config.css                           (../../shared/config.css)
   skin/classic/global/icons/info.svg                       (../../shared/incontent-icons/info.svg)
   skin/classic/global/icons/loading-inverted.png           (../../shared/icons/loading-inverted.png)
   skin/classic/global/icons/loading-inverted@2x.png        (../../shared/icons/loading-inverted@2x.png)
   skin/classic/global/icons/warning.svg                    (../../shared/incontent-icons/warning.svg)
   skin/classic/global/alerts/alert-common.css              (../../shared/alert-common.css)
+  skin/classic/global/narrate.css                          (../../shared/narrate.css)
+  skin/classic/global/narrateControls.css                  (../../shared/narrateControls.css)
+  skin/classic/global/narrate/arrow.svg                     (../../shared/narrate/arrow.svg)
+  skin/classic/global/narrate/back.svg                     (../../shared/narrate/back.svg)
+  skin/classic/global/narrate/fast.svg                     (../../shared/narrate/fast.svg)
+  skin/classic/global/narrate/forward.svg                  (../../shared/narrate/forward.svg)
+  skin/classic/global/narrate/narrate.svg                  (../../shared/narrate/narrate.svg)
+  skin/classic/global/narrate/slow.svg                     (../../shared/narrate/slow.svg)
+  skin/classic/global/narrate/start.svg                    (../../shared/narrate/start.svg)
+  skin/classic/global/narrate/stop.svg                     (../../shared/narrate/stop.svg)
   skin/classic/global/menu/shared-menu-check@2x.png        (../../shared/menu-check@2x.png)
   skin/classic/global/menu/shared-menu-check.png           (../../shared/menu-check.png)
   skin/classic/global/menu/shared-menu-check-active.svg    (../../shared/menu-check-active.svg)
   skin/classic/global/menu/shared-menu-check-black.svg     (../../shared/menu-check-black.svg)
   skin/classic/global/menu/shared-menu-check-hover.svg     (../../shared/menu-check-hover.svg)
   skin/classic/global/in-content/check.svg                 (../../shared/in-content/check.svg)
   skin/classic/global/in-content/check-partial.svg         (../../shared/in-content/check-partial.svg)
   skin/classic/global/in-content/dropdown.svg              (../../shared/in-content/dropdown.svg)
new file mode 100644
--- /dev/null
+++ b/toolkit/themes/shared/narrate.css
@@ -0,0 +1,11 @@
+body.light .narrating {
+  background-color: #ffc;
+}
+
+body.sepia .narrating {
+  background-color: #e0d7c5;
+}
+
+body.dark .narrating {
+  background-color: #242424;
+}
new file mode 100644
--- /dev/null
+++ b/toolkit/themes/shared/narrate/arrow.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 12 12">
+  <path d="M6 9L1 4l1-1 4 4 4-4 1 1z" fill="#4C4C4C"/>
+</svg>
new file mode 100644
--- /dev/null
+++ b/toolkit/themes/shared/narrate/back.svg
@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24">
+  <defs>
+    <style>
+      use:not(:target) {
+        display: none;
+      }
+      #disabled {
+        opacity: 0.5;
+      }
+    </style>
+    <path id="shape" d="M 5 0 C 4.446 0 4 0.446 4 1 L 4 23 C 4 23.554 4.446 24 5 24 L 7 24 C 7.554 24 8 23.554 8 23 L 8 12.404297 C 8.04108 12.509297 8.109944 12.610125 8.203125 12.703125 L 19.296875 23.775391 C 19.495259 23.972391 19.661613 24.039562 19.796875 23.976562 C 19.932137 23.915564 20 23.748516 20 23.478516 L 20 0.52148438 C 20 0.25248437 19.93214 0.084484365 19.796875 0.021484375 C 19.661613 -0.040515625 19.495259 0.02856248 19.296875 0.2265625 L 8.203125 11.298828 C 8.1099445 11.381828 8.04108 11.481703 8 11.595703 L 8 1 C 8 0.446 7.554 0 7 0 L 5 0 z " fill="gray"/>
+  </defs>
+  <use id="enabled" xlink:href="#shape"/>
+  <use id="disabled" xlink:href="#shape"/>
+</svg>
new file mode 100644
--- /dev/null
+++ b/toolkit/themes/shared/narrate/fast.svg
@@ -0,0 +1,3 @@
+<svg id="Icons" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 20.4">
+    <path fill="gray" d="M14.42 16.68a.77.77 0 0 0 .54.7l2.51.68a1.58 1.58 0 0 1 1.06 1.22l.05.39-3.89-.53a4.34 4.34 0 0 1-1.74-.72L7.2 14.03a5.79 5.79 0 0 1-5.34-4.88h-.82a1 1 0 0 1-1-1l2.9-3.24a6.16 6.16 0 0 1 4.7-2.39 5.88 5.88 0 0 1 .77.05 5 5 0 0 1 .87.15c3.75 1 6.5 5.84 6.5 5.84a2.27 2.27 0 0 0 1.14.85h.17a1.27 1.27 0 0 0 1.22-.4l.78-1-2.47-1.2c-3.38-1.46-2.46-5.71-2.46-5.71 0-.26.23-.32.42-.14l5.32 5-4.31-4.81a1.39 1.39 0 0 1 .81-1.22l4.17 6.65.33.31 2.19 1.54a2.44 2.44 0 0 1 .92 1.75v2.77l-.16.13a1.66 1.66 0 0 1-1.63.19l-.75-.36a2.57 2.57 0 0 0-2.55.32l-2.18 1.82a4.28 4.28 0 0 1-.89.55 10.18 10.18 0 0 0-4.62-8.46c-.27-.16-.66.31-.47.48a10.52 10.52 0 0 1 3.68 8.5v.48zm8.38-5.42a.49.49 0 1 0-.49-.49.49.49 0 0 0 .49.49zm-18 9.14v-.52a1.39 1.39 0 0 1 .93-1.25s2.7-.66 3.43-1.84l2.06 1.63a25.62 25.62 0 0 1-6.43 2z"/>
+</svg>
new file mode 100644
--- /dev/null
+++ b/toolkit/themes/shared/narrate/forward.svg
@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24">
+  <defs>
+    <style>
+      use:not(:target) {
+        display: none;
+      }
+      #disabled {
+        opacity: 0.5;
+      }
+    </style>
+    <path id="shape" d="m 19,0 c 0.554,0 1,0.446 1,1 l 0,22 c 0,0.554 -0.446,1 -1,1 l -2,0 c -0.554,0 -1,-0.446 -1,-1 l 0,-10.595703 c -0.04108,0.105 -0.109944,0.205828 -0.203125,0.298828 L 4.703125,23.775391 c -0.198384,0.197 -0.364738,0.264171 -0.5,0.201171 C 4.067863,23.915564 4,23.748516 4,23.478516 L 4,0.52148438 c 0,-0.26900001 0.06786,-0.43700001 0.203125,-0.5 0.135262,-0.062 0.301616,0.0070781 0.5,0.20507812 l 11.09375,11.0722655 c 0.09318,0.083 0.162045,0.182875 0.203125,0.296875 L 16,1 c 0,-0.554 0.446,-1 1,-1 l 2,0 z" fill="gray"/>
+  </defs>
+  <use id="enabled" xlink:href="#shape"/>
+  <use id="disabled" xlink:href="#shape"/>
+</svg>
new file mode 100644
--- /dev/null
+++ b/toolkit/themes/shared/narrate/narrate.svg
@@ -0,0 +1,3 @@
+<svg id="Icons" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 22 18.77">
+    <path fill="gray" d="M3.13 13.72a1.57 1.57 0 0 1-3.13 0V5.41a1.57 1.57 0 0 1 3.13 0v8.31zm6.29 3.62a1.57 1.57 0 0 1-3.13 0V1.44a1.57 1.57 0 0 1 3.13 0v15.9zm6.29-2.9a1.57 1.57 0 0 1-3.13 0V4.83a1.57 1.57 0 0 1 3.13 0v9.61zM22 12.62a1.57 1.57 0 0 1-3.13 0V6.15a1.57 1.57 0 0 1 3.13 0v6.47z"/>
+</svg>
new file mode 100644
--- /dev/null
+++ b/toolkit/themes/shared/narrate/slow.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+    <g fill="gray">
+        <path d="M1.684,13.486c-0.209,0-0.404-0.132-0.474-0.341c-0.528-1.58-0.23-5.767,4.097-7.921 c1.315-0.656,2.589-0.988,3.787-0.988c3.237,0,5.096,2.341,5.99,3.465c0.158,0.199,0.181,0.533,0,0.713 c-0.793,0.794-1.852,1.542-3.231,2.286c-2.46,1.327-5.045,1.775-7.121,2.134c-1.123,0.194-2.093,0.361-2.89,0.627 C1.789,13.479,1.735,13.486,1.684,13.486L1.684,13.486z"/>
+        <path d="M23.185,5.465c-0.86-1.121-2.074-1.819-3.168-1.819c-0.641,0-1.556,0.23-2.273,1.328 c-0.374,0.571-0.577,1.161-0.773,1.73c-0.512,1.482-1.041,3.016-4.662,4.969c-2.316,1.249-4.707,1.664-6.815,2.03 c-2.524,0.438-4.704,0.814-5.455,2.622c-0.069,0.165-0.045,0.354,0.062,0.495c0.107,0.143,0.281,0.217,0.46,0.193 c0.667-0.081,1.533,0.041,2.434,0.217c-0.122,0.146-0.261,0.286-0.391,0.418c-0.38,0.385-0.774,0.783-0.657,1.292 c0.108,0.474,0.604,0.699,0.966,0.828c0.399,0.142,0.843,0.217,1.283,0.217c1.241,0,2.216-0.579,2.649-1.539 c1.704,0.287,3.487,0.313,5.043,0.313l1.639-0.006c0.066,0.056,0.178,0.166,0.264,0.25c0.504,0.506,1.348,1.351,2.721,1.351 c0.129,0,0.264-0.008,0.416-0.026c0.687-0.102,1.351-0.267,1.574-0.787c0.227-0.528-0.123-1.023-0.526-1.597 c-0.481-0.685-1.08-1.532-0.998-2.652c0.196-0.397,0.368-0.824,0.546-1.267c0.479-1.19,0.975-2.421,2.12-3.513 c0.431,0.343,1.022,0.549,1.63,0.549l0,0c0.439,0,0.876-0.102,1.295-0.3c0.624-0.293,1.104-0.967,1.316-1.847 C24.175,7.707,23.914,6.418,23.185,5.465L23.185,5.465z M20.397,7.757c-0.276,0-0.5-0.224-0.5-0.5s0.224-0.5,0.5-0.5 c0.275,0,0.5,0.224,0.5,0.5S20.674,7.757,20.397,7.757z"/>
+    </g>
+</svg>
new file mode 100644
--- /dev/null
+++ b/toolkit/themes/shared/narrate/start.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+    <path d="M21.64 12.44L2.827 22.895c-.217.123-.403.137-.56.042-.155-.094-.233-.264-.233-.51V1.572c0-.244.08-.414.233-.51.157-.093.343-.08.56.044L21.642 11.56c.217.124.326.27.326.44 0 .17-.11.316-.327.44z" fill="gray"/>
+</svg>
new file mode 100644
--- /dev/null
+++ b/toolkit/themes/shared/narrate/stop.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+    <rect ry="1" rx="1" y="2" x="2" height="20" width="20" fill="gray"/>
+</svg>
new file mode 100644
--- /dev/null
+++ b/toolkit/themes/shared/narrateControls.css
@@ -0,0 +1,184 @@
+:scope {
+  --border-color: #e5e5e5;
+}
+
+#narrate-toggle {
+  background-image: url("chrome://global/skin/narrate/narrate.svg");
+}
+
+.dropdown-popup button {
+  background-color: transparent;
+}
+
+.dropdown-popup button:hover:not(:disabled) {
+  background-color: #eaeaea;
+}
+
+.narrate-row {
+  display: flex;
+  align-items: center;
+  min-height: 40px;
+  box-sizing: border-box;
+}
+
+.narrate-row:not(:first-child) {
+  border-top: 1px solid var(--border-color);
+}
+
+/* Control buttons */
+
+#narrate-control > button {
+  background-size: 24px 24px;
+  background-repeat: no-repeat;
+  background-position: center center;
+  height: 64px;
+  width: 100px;
+  border: none;
+  color: #666;
+  box-sizing: border-box;
+}
+
+#narrate-control > button:not(:first-child) {
+  border-left: 1px solid var(--border-color);
+}
+
+#narrate-skip-previous {
+  border-top-left-radius: 3px;
+  background-image: url("chrome://global/skin/narrate/back.svg#enabled");
+}
+
+#narrate-skip-next {
+  border-top-right-radius: 3px;
+  background-image: url("chrome://global/skin/narrate/forward.svg#enabled");
+}
+
+#narrate-skip-previous:disabled {
+  background-image: url("chrome://global/skin/narrate/back.svg#disabled");
+}
+
+#narrate-skip-next:disabled {
+  background-image: url("chrome://global/skin/narrate/forward.svg#disabled");
+}
+
+#narrate-start-stop {
+  background-image: url("chrome://global/skin/narrate/start.svg");
+}
+
+#narrate-start-stop.speaking {
+  background-image: url("chrome://global/skin/narrate/stop.svg");
+}
+
+/* Rate control */
+
+#narrate-rate::before, #narrate-rate::after {
+  content: '';
+  width: 48px;
+  height: 40px;
+  background-position: center;
+  background-repeat: no-repeat;
+  background-size: 24px auto;
+}
+
+#narrate-rate::before {
+  background-image: url("chrome://global/skin/narrate/slow.svg");
+}
+
+#narrate-rate::after {
+  background-image: url("chrome://global/skin/narrate/fast.svg");
+}
+
+#narrate-rate-input {
+  margin: 0 1px;
+  flex-grow: 1;
+}
+
+#narrate-rate-input::-moz-range-track {
+  background-color: #979797;
+  height: 2px;
+}
+
+#narrate-rate-input::-moz-range-progress {
+  background-color: #2EA3FF;
+  height: 2px;
+}
+
+#narrate-rate-input::-moz-range-thumb {
+  background-color: #808080;
+  height: 16px;
+  width: 16px;
+  border-radius: 8px;
+  border-width: 0;
+}
+
+#narrate-rate-input:active::-moz-range-thumb {
+  background-color: #2EA3FF;
+}
+
+/* Voice selection */
+
+.voiceselect {
+  width: 100%;
+}
+
+.voiceselect > button.select-toggle,
+.voiceselect > .options > button.option {
+  -moz-appearance: none;
+  border: none;
+  width: 100%;
+  min-height: 40px;
+}
+
+.voiceselect.open > button.select-toggle {
+  border-bottom: 1px solid var(--border-color);
+}
+
+.voiceselect > button.select-toggle::after {
+  content: '';
+  background-image: url("chrome://global/skin/narrate/arrow.svg");
+  background-position: center;
+  background-repeat: no-repeat;
+  background-size: 12px 12px;
+  display: inline-block;
+  width: 1.5em;
+  height: 1em;
+  vertical-align: middle;
+}
+
+.voiceselect > .options > button.option:not(:first-child) {
+  border-top: 1px solid var(--border-color);
+}
+
+.voiceselect > .options > button.option  {
+  box-sizing: border-box;
+}
+
+.voiceselect > .options:not(.hovering) > button.option:focus {
+  background-color: #eaeaea;
+}
+
+.voiceselect > .options:not(.hovering) > button.option:hover:not(:focus) {
+  background-color: transparent;
+}
+
+.voiceselect > .options > button.option::-moz-focus-inner {
+  outline: none;
+  border: 0;
+}
+
+.voiceselect > .options {
+  display: none;
+  overflow-y: auto;
+}
+
+.voiceselect.open > .options {
+  display: block;
+}
+
+.current-voice {
+  color: #7f7f7f;
+}
+
+.voiceselect:not(.open) > button,
+.option:last-child {
+  border-radius: 0 0 3px 3px;
+}