diff -Naur firefox-45.0esr.bak/browser/base/content/browser.js firefox-45.0esr/browser/base/content/browser.js
--- firefox-45.0esr.bak/browser/base/content/browser.js	2016-03-15
+++ firefox-45.0esr/browser/base/content/browser.js	2016-03-15
@@ -251,9 +251,6 @@
 XPCOMUtils.defineLazyModuleGetter(this, "ReaderMode",
   "resource://gre/modules/ReaderMode.jsm");
 
-XPCOMUtils.defineLazyModuleGetter(this, "ReaderParent",
-  "resource:///modules/ReaderParent.jsm");
-
 XPCOMUtils.defineLazyModuleGetter(this, "LoginManagerParent",
   "resource://gre/modules/LoginManagerParent.jsm");
 
@@ -4574,7 +4571,6 @@
       }
     }
     UpdateBackForwardCommands(gBrowser.webNavigation);
-    ReaderParent.updateReaderButton(gBrowser.selectedBrowser);
 
     gGestureSupport.restoreRotationState();
 
diff -Naur firefox-45.0esr.bak/browser/base/content/browser-sets.inc firefox-45.0esr/browser/base/content/browser-sets.inc
--- firefox-45.0esr.bak/browser/base/content/browser-sets.inc	2016-03-15
+++ firefox-45.0esr/browser/base/content/browser-sets.inc	2016-03-15
@@ -42,7 +42,6 @@
     <command id="View:PageSource" oncommand="BrowserViewSource(window.gBrowser.selectedBrowser);" observes="canViewSource"/>
     <command id="View:PageInfo" oncommand="BrowserPageInfo();"/>
     <command id="View:FullScreen" oncommand="BrowserFullScreen();"/>
-    <command id="View:ReaderView" oncommand="ReaderParent.toggleReaderMode(event);"/>
     <command id="cmd_find"
              oncommand="gFindBar.onFindCommand();"
              observes="isImage"/>
diff -Naur firefox-45.0esr.bak/browser/base/content/browser.xul firefox-45.0esr/browser/base/content/browser.xul
--- firefox-45.0esr.bak/browser/base/content/browser.xul	2016-03-15
+++ firefox-45.0esr/browser/base/content/browser.xul	2016-03-15
@@ -731,10 +731,6 @@
                        hidden="true"
                        tooltiptext="&pageReportIcon.tooltip;"
                        onclick="gPopupBlockerObserver.onReportButtonClick(event);"/>
-                <image id="reader-mode-button"
-                       class="urlbar-icon"
-                       hidden="true"
-                       onclick="ReaderParent.buttonClick(event);"/>
               </hbox>
               <hbox id="userContext-icons">
                 <label id="userContext-label"/>
diff -Naur firefox-45.0esr.bak/browser/components/nsBrowserGlue.js firefox-45.0esr/browser/components/nsBrowserGlue.js
--- firefox-45.0esr.bak/browser/components/nsBrowserGlue.js	2016-03-15
+++ firefox-45.0esr/browser/components/nsBrowserGlue.js	2016-03-15
@@ -177,9 +177,6 @@
 XPCOMUtils.defineLazyModuleGetter(this, "WebChannel",
                                   "resource://gre/modules/WebChannel.jsm");
 
-XPCOMUtils.defineLazyModuleGetter(this, "ReaderParent",
-                                  "resource:///modules/ReaderParent.jsm");
-
 XPCOMUtils.defineLazyModuleGetter(this, "AddonWatcher",
                                   "resource://gre/modules/AddonWatcher.jsm");
 
@@ -850,7 +847,6 @@
     ContentPrefServiceParent.init();
 
     LoginManagerParent.init();
-    ReaderParent.init();
 
     SelfSupportBackend.init();
 
diff -Naur firefox-45.0esr.bak/browser/components/uitour/UITour.jsm firefox-45.0esr/browser/components/uitour/UITour.jsm
--- firefox-45.0esr.bak/browser/components/uitour/UITour.jsm	2016-03-15
+++ firefox-45.0esr/browser/components/uitour/UITour.jsm	2016-03-15
@@ -34,8 +34,6 @@
   "resource://gre/modules/PrivateBrowsingUtils.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "ReaderMode",
   "resource://gre/modules/ReaderMode.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "ReaderParent",
-  "resource:///modules/ReaderParent.jsm");
 
 // See LOG_LEVELS in Console.jsm. Common examples: "All", "Info", "Warn", & "Error".
 const PREF_LOG_LEVEL      = "browser.uitour.loglevel";
@@ -722,15 +720,10 @@
       }
 
       case "forceShowReaderIcon": {
-        ReaderParent.forceShowReaderIcon(browser);
         break;
       }
 
       case "toggleReaderMode": {
-        let targetPromise = this.getTarget(window, "readerMode-urlBar");
-        targetPromise.then(target => {
-          ReaderParent.toggleReaderMode({target: target.node});
-        });
         break;
       }
     }
@@ -1911,7 +1904,6 @@
     }
 
     if (aFeature == "readinglist") {
-      ReaderParent.showReaderModeInfoPanel(browser);
     } else {
       log.error("startSubTour: Unknown feature option specified");
       return;
diff -Naur firefox-45.0esr.bak/browser/modules/moz.build firefox-45.0esr/browser/modules/moz.build
--- firefox-45.0esr.bak/browser/modules/moz.build	2016-03-15
+++ firefox-45.0esr/browser/modules/moz.build	2016-03-15
@@ -33,7 +33,6 @@
     'offlineAppCache.jsm',
     'PanelFrame.jsm',
     'PluginContent.jsm',
-    'ReaderParent.jsm',
     'RecentWindow.jsm',
     'RemotePrompt.jsm',
     'SelfSupportBackend.jsm',