--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -71,7 +71,6 @@ XPCOMUtils.defineLazyGetter(this, "exten
   ["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"],
@@ -4725,7 +4724,6 @@ var XULBrowserWindow = {
       }
     }
     UpdateBackForwardCommands(gBrowser.webNavigation);
-    ReaderParent.updateReaderButton(gBrowser.selectedBrowser);
 
     gGestureSupport.restoreRotationState();
 
--- a/browser/base/content/browser-sets.inc
+++ b/browser/base/content/browser-sets.inc
@@ -48,7 +48,6 @@
     <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"/>
--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -902,10 +902,6 @@
                        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();"
                        tooltip="dynamic-shortcut-tooltip"
--- a/browser/components/nsBrowserGlue.js
+++ b/browser/components/nsBrowserGlue.js
@@ -83,7 +83,6 @@ let initializedModules = {};
   ["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"],
   ["SessionStore", "resource:///modules/sessionstore/SessionStore.jsm"],
@@ -156,9 +155,6 @@ const listeners = {
     "FormValidation:ShowPopup": ["FormValidationHandler"],
     "FormValidation:HidePopup": ["FormValidationHandler"],
     "Prompt:Open": ["RemotePrompt"],
-    "Reader:ArticleGet": ["ReaderParent"],
-    "Reader:FaviconRequest": ["ReaderParent"],
-    "Reader:UpdateReaderButton": ["ReaderParent"],
     // PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN LoginManagerParent.init
     "RemoteLogins:findLogins": ["LoginManagerParent"],
     "RemoteLogins:findRecipes": ["LoginManagerParent"],
--- a/browser/components/uitour/UITour.jsm
+++ b/browser/components/uitour/UITour.jsm
@@ -32,8 +32,6 @@ XPCOMUtils.defineLazyModuleGetter(this,
   "resource://gre/modules/PrivateBrowsingUtils.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "ProfileAge",
   "resource://gre/modules/ProfileAge.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "ReaderParent",
-  "resource:///modules/ReaderParent.jsm");
 
 XPCOMUtils.defineLazyPreferenceGetter(this, "gPhotonStructure", "browser.photon.structure.enabled");
 
@@ -663,15 +661,10 @@ this.UITour = {
       }
 
       case "forceShowReaderIcon": {
-        ReaderParent.forceShowReaderIcon(browser);
         break;
       }
 
       case "toggleReaderMode": {
-        let targetPromise = this.getTarget(window, "readerMode-urlBar");
-        targetPromise.then(target => {
-          ReaderParent.toggleReaderMode({target: target.node});
-        });
         break;
       }
 
--- a/browser/modules/moz.build
+++ b/browser/modules/moz.build
@@ -150,7 +150,6 @@
     'PermissionUI.jsm',
     'PluginContent.jsm',
     'ProcessHangMonitor.jsm',
-    'ReaderParent.jsm',
     'RecentWindow.jsm',
     'RemotePrompt.jsm',
     'Sanitizer.jsm',