3 files changed, 2 insertions, 93 deletions

diff --git a/toolkit/components/reader/AboutReader.jsm b/toolkit/components/reader/AboutReader.jsm
index 9d9362a0c..3958af081 100644
--- a/toolkit/components/reader/AboutReader.jsm
+++ b/toolkit/components/reader/AboutReader.jsm
@@ -70,8 +70,6 @@ var AboutReader = function(win, articlePromise) {
 
   Services.obs.addObserver(this, "inner-window-destroyed", false);
 
-  doc.addEventListener("visibilitychange", this);
-
   this._setupStyleDropdown();
   this._setupButton("close-button", this._onReaderClose.bind(this), "aboutReader.toolbar.close");
 
@@ -238,14 +236,6 @@ AboutReader.prototype = {
         }
         break;
 
-      case "devicelight":
-        this._handleDeviceLight(aEvent.value);
-        break;
-
-      case "visibilitychange":
-        this._handleVisibilityChange();
-        break;
-
       case "pagehide":
         // Close the Banners Font-dropdown, cleanup Android BackPressListener.
         this._closeDropdowns();
@@ -310,10 +300,6 @@ AboutReader.prototype = {
     const FONT_SIZE_MIN = 1;
     const FONT_SIZE_MAX = 9;
 
-    // Sample text shown in Android UI.
-    let sampleText = this._doc.querySelector(".font-size-sample");
-    sampleText.textContent = gStrings.GetStringFromName("aboutReader.fontTypeSample");
-
     let currentSize = Services.prefs.getIntPref("reader.font_size");
     currentSize = Math.max(FONT_SIZE_MIN, Math.min(FONT_SIZE_MAX, currentSize));
 
@@ -503,77 +489,8 @@ AboutReader.prototype = {
     }, true);
   },
 
-  _handleDeviceLight(newLux) {
-    // Desired size of the this._luxValues array.
-    let luxValuesSize = 10;
-    // Add new lux value at the front of the array.
-    this._luxValues.unshift(newLux);
-    // Add new lux value to this._totalLux for averaging later.
-    this._totalLux += newLux;
-
-    // Don't update when length of array is less than luxValuesSize except when it is 1.
-    if (this._luxValues.length < luxValuesSize) {
-      // Use the first lux value to set the color scheme until our array equals luxValuesSize.
-      if (this._luxValues.length == 1) {
-        this._updateColorScheme(newLux);
-      }
-      return;
-    }
-    // Holds the average of the lux values collected in this._luxValues.
-    let averageLuxValue = this._totalLux / luxValuesSize;
-
-    this._updateColorScheme(averageLuxValue);
-    // Pop the oldest value off the array.
-    let oldLux = this._luxValues.pop();
-    // Subtract oldLux since it has been discarded from the array.
-    this._totalLux -= oldLux;
-  },
-
-  _handleVisibilityChange() {
-    let colorScheme = Services.prefs.getCharPref("reader.color_scheme");
-    if (colorScheme != "auto") {
-      return;
-    }
-
-    // Turn off the ambient light sensor if the page is hidden
-    this._enableAmbientLighting(!this._doc.hidden);
-  },
-
-  // Setup or teardown the ambient light tracking system.
-  _enableAmbientLighting(enable) {
-    if (enable) {
-      this._win.addEventListener("devicelight", this);
-      this._luxValues = [];
-      this._totalLux = 0;
-    } else {
-      this._win.removeEventListener("devicelight", this);
-      delete this._luxValues;
-      delete this._totalLux;
-    }
-  },
-
-  _updateColorScheme(luxValue) {
-    // Upper bound value for "dark" color scheme beyond which it changes to "light".
-    let upperBoundDark = 50;
-    // Lower bound value for "light" color scheme beyond which it changes to "dark".
-    let lowerBoundLight = 10;
-    // Threshold for color scheme change.
-    let colorChangeThreshold = 20;
-
-    // Ignore changes that are within a certain threshold of previous lux values.
-    if ((this._colorScheme === "dark" && luxValue < upperBoundDark) ||
-        (this._colorScheme === "light" && luxValue > lowerBoundLight))
-      return;
-
-    if (luxValue < colorChangeThreshold)
-      this._setColorScheme("dark");
-    else
-      this._setColorScheme("light");
-  },
-
   _setColorScheme(newColorScheme) {
-    // "auto" is not a real color scheme
-    if (this._colorScheme === newColorScheme || newColorScheme === "auto")
+    if (this._colorScheme === newColorScheme)
       return;
 
     let bodyClasses = this._doc.body.classList;
@@ -585,10 +502,8 @@ AboutReader.prototype = {
     bodyClasses.add(this._colorScheme);
   },
 
-  // Pref values include "dark", "light", and "auto", which automatically switches
-  // between light and dark color schemes based on the ambient light level.
+  // Pref values include "dark", "light", and "sepia".
   _setColorSchemePref(colorSchemePref) {
-    this._enableAmbientLighting(colorSchemePref === "auto");
     this._setColorScheme(colorSchemePref);
 
     AsyncPrefs.set("reader.color_scheme", colorSchemePref);
diff --git a/toolkit/components/reader/content/aboutReader.html b/toolkit/components/reader/content/aboutReader.html
index 1aa644474..58006c0a5 100644
--- a/toolkit/components/reader/content/aboutReader.html
+++ b/toolkit/components/reader/content/aboutReader.html
@@ -42,7 +42,6 @@
         <hr>
         <div class="font-size-buttons">
           <button class="minus-button"/>
-          <button class="font-size-sample"/>
           <button class="plus-button"/>
         </div>
         <hr>
diff --git a/toolkit/themes/shared/aboutReader.css b/toolkit/themes/shared/aboutReader.css
index ff8f27565..1bfbd0309 100644
--- a/toolkit/themes/shared/aboutReader.css
+++ b/toolkit/themes/shared/aboutReader.css
@@ -445,11 +445,6 @@ body:not(.loaded) .toolbar:-moz-locale-dir(rtl) {
   background-color: #dadada;
 }
 
-/* Only used on Android */
-.font-size-sample {
-  display: none;
-}
-
 .minus-button,
 .plus-button,
 .content-width-minus-button,