--- firefox-52.0esr.bak/browser/base/content/browser.js	2017-03-09
+++ firefox-52.0esr/browser/base/content/browser.js	2017-03-09
@@ -38,7 +38,6 @@
   ["ProcessHangMonitor", "resource:///modules/ProcessHangMonitor.jsm"],
   ["PromiseUtils", "resource://gre/modules/PromiseUtils.jsm"],
   ["ReaderMode", "resource://gre/modules/ReaderMode.jsm"],
-  ["ReaderParent", "resource:///modules/ReaderParent.jsm"],
   ["RecentWindow", "resource:///modules/RecentWindow.jsm"],
   ["SessionStore", "resource:///modules/sessionstore/SessionStore.jsm"],
   ["ShortcutUtils", "resource://gre/modules/ShortcutUtils.jsm"],
@@ -4574,7 +4573,6 @@
       }
     }
     UpdateBackForwardCommands(gBrowser.webNavigation);
-    ReaderParent.updateReaderButton(gBrowser.selectedBrowser);
 
     gGestureSupport.restoreRotationState();
 
--- firefox-52.0esr.bak/browser/base/content/browser-sets.inc	2017-03-09
+++ firefox-52.0esr/browser/base/content/browser-sets.inc	2017-03-09
@@ -43,7 +43,6 @@
     <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"/>
--- firefox-52.0esr.bak/browser/base/content/browser.xul	2017-03-09
+++ firefox-52.0esr/browser/base/content/browser.xul	2017-03-09
@@ -766,10 +766,6 @@
                        hidden="true"
                        tooltiptext="&pageReportIcon.tooltip;"
                        onmousedown="gPopupBlockerObserver.onReportButtonMousedown(event);"/>
-                <image id="reader-mode-button"
-                       class="urlbar-icon"
-                       hidden="true"
-                       onclick="ReaderParent.buttonClick(event);"/>
                 <toolbarbutton id="urlbar-zoom-button"
                        onclick="FullZoom.reset();"
                        tooltiptext="&urlbar.zoomReset.tooltip;"
--- firefox-52.0esr.bak/browser/components/nsBrowserGlue.js	2017-03-09
+++ firefox-52.0esr/browser/components/nsBrowserGlue.js	2017-03-09
@@ -53,7 +53,6 @@
   ["PluralForm", "resource://gre/modules/PluralForm.jsm"],
   ["PrivateBrowsingUtils", "resource://gre/modules/PrivateBrowsingUtils.jsm"],
   ["ProcessHangMonitor", "resource:///modules/ProcessHangMonitor.jsm"],
-  ["ReaderParent", "resource:///modules/ReaderParent.jsm"],
   ["RecentWindow", "resource:///modules/RecentWindow.jsm"],
   ["RemotePrompt", "resource:///modules/RemotePrompt.jsm"],
   ["SelfSupportBackend", "resource:///modules/SelfSupportBackend.jsm"],
@@ -670,7 +669,6 @@
     ContentPrefServiceParent.init();
 
     LoginManagerParent.init();
-    ReaderParent.init();
     URLBarZoom.init();
 
     SelfSupportBackend.init();
--- firefox-52.0esr.bak/browser/components/uitour/UITour.jsm	2017-03-09
+++ firefox-52.0esr/browser/components/uitour/UITour.jsm	2017-03-09
@@ -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";
@@ -661,15 +654,10 @@
       }
 
       case "forceShowReaderIcon": {
-        ReaderParent.forceShowReaderIcon(browser);
         break;
       }
 
       case "toggleReaderMode": {
-        let targetPromise = this.getTarget(window, "readerMode-urlBar");
-        targetPromise.then(target => {
-          ReaderParent.toggleReaderMode({target: target.node});
-        });
         break;
       }
 
@@ -1948,7 +1896,6 @@
     }
 
     if (aFeature == "readinglist") {
-      ReaderParent.showReaderModeInfoPanel(browser);
     } else {
       log.error("startSubTour: Unknown feature option specified");
       return;
--- firefox-52.0esr.bak/browser/modules/moz.build	2017-03-09
+++ firefox-52.0esr/browser/modules/moz.build	2017-03-09
@@ -35,7 +35,6 @@
     'PermissionUI.jsm',
     'PluginContent.jsm',
     'ProcessHangMonitor.jsm',
-    'ReaderParent.jsm',
     'RecentWindow.jsm',
     'RemotePrompt.jsm',
     'Sanitizer.jsm',