--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -1868,15 +1868,13 @@ pref("dom.ipc.processHangMonitor", true)
 #ifdef DEBUG
 // Don't report hangs in DEBUG builds. They're too slow and often a
 // debugger is attached.
 pref("dom.ipc.reportProcessHangs", false);
 #else
 pref("dom.ipc.reportProcessHangs", true);
 #endif
 
-#ifndef NIGHTLY_BUILD
 // Disable reader mode by default.
 pref("reader.parse-on-load.enabled", false);
-#endif
 
 // Disable ReadingList by default.
 pref("browser.readinglist.enabled", false);

--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -853,11 +853,8 @@ pref("media.gmp-provider.enabled", true)
 // (auto only works on platforms where the 'devicelight' event is enabled)
 pref("reader.color_scheme", "auto");
 
 // Color scheme values available in reader mode UI.
 pref("reader.color_scheme.values", "[\"light\",\"dark\",\"auto\"]");
 
 // Whether to use a vertical or horizontal toolbar.
 pref("reader.toolbar.vertical", false);
-
-// Whether or not to display buttons related to reading list in reader view.
-pref("browser.readinglist.enabled", true);

--- a/toolkit/components/reader/AboutReader.jsm
+++ b/toolkit/components/reader/AboutReader.jsm
@@ -52,26 +52,19 @@ let AboutReader = function(mm, win) {
   win.addEventListener("unload", this, false);
   win.addEventListener("scroll", this, false);
   win.addEventListener("resize", this, false);
 
   doc.addEventListener("visibilitychange", this, false);
 
   this._setupStyleDropdown();
   this._setupButton("close-button", this._onReaderClose.bind(this), "aboutReader.toolbar.close");
+  this._setupButton("toggle-button", this._onReaderToggle.bind(this), "aboutReader.toolbar.addToReadingList");
   this._setupButton("share-button", this._onShare.bind(this), "aboutReader.toolbar.share");
-
-  try {
-    if (Services.prefs.getBoolPref("browser.readinglist.enabled")) {
-      this._setupButton("toggle-button", this._onReaderToggle.bind(this), "aboutReader.toolbar.addToReadingList");
-      this._setupButton("list-button", this._onList.bind(this), "aboutReader.toolbar.openReadingList");
-    }
-  } catch (e) {
-    // Pref doesn't exist.
-  }
+  this._setupButton("list-button", this._onList.bind(this), "aboutReader.toolbar.openReadingList");
 
   let colorSchemeValues = JSON.parse(Services.prefs.getCharPref("reader.color_scheme.values"));
   let colorSchemeOptions = colorSchemeValues.map((value) => {
     return { name: gStrings.GetStringFromName("aboutReader.colorScheme." + value),
              value: value,
              itemClass: value + "-button" };
   });
 
@@ -701,17 +694,16 @@ AboutReader.prototype = {
 
       if (option.value === initialValue)
         item.classList.add("selected");
     }
   },
 
   _setupButton: function Reader_setupButton(id, callback, titleEntity) {
     let button = this._doc.getElementById(id);
-    button.removeAttribute("hidden");
     button.setAttribute("title", gStrings.GetStringFromName(titleEntity));
 
     button.addEventListener("click", function(aEvent) {
       if (!aEvent.isTrusted)
         return;
 
       aEvent.stopPropagation();
       callback();

--- a/toolkit/components/reader/content/aboutReader.html
+++ b/toolkit/components/reader/content/aboutReader.html
@@ -33,15 +33,15 @@
         <ul id="font-type-buttons"></ul>
         <hr></hr>
         <ul id="font-size-buttons" class="segmented-button"></ul>
         <hr></hr>
         <ul id="color-scheme-buttons" class="segmented-button"></ul>
         <div class="dropdown-arrow"/>
       </li>
     </ul>
-    <li><button id="toggle-button" class="button toggle-button" hidden="true"/></li>
-    <li><button id="list-button" class="button list-button" hidden="true"/></li>
+    <li><button id="toggle-button" class="button toggle-button"/></li>
+    <li><button id="list-button" class="button list-button"/></li>
   </ul>
 
 </body>
 
 </html>

--- a/toolkit/themes/windows/global/aboutReader.css
+++ b/toolkit/themes/windows/global/aboutReader.css
@@ -243,20 +243,16 @@ body {
   height: 40px;
   width: 40px;
   border-top: 0;
   border-left: 0;
   border-right: 0;
   border-bottom: 1px solid #c1c1c1;
 }
 
-.button[hidden] {
-  display: none;
-}
-
 .dropdown {
   text-align: center;
   list-style: none;
   margin: 0px;
   padding: 0px;
 }
 
 .dropdown li {