--- a/browser/base/content/browser-sets.inc
+++ b/browser/base/content/browser-sets.inc
@@ -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"/>
@@ -284,7 +283,6 @@
     <key id="key_fullScreen_old" key="&fullScreenCmd.macCommandKey;" command="View:FullScreen" modifiers="accel,shift"/>
     <key keycode="VK_F11" command="View:FullScreen"/>
 #endif
-    <key id="key_toggleReaderMode" key="&toggleReaderMode.key;" command="View:ReaderView" modifiers="accel,alt" disabled="true"/>
     <key key="&reloadCmd.commandkey;" command="Browser:Reload" modifiers="accel" id="key_reload"/>
     <key key="&reloadCmd.commandkey;" command="Browser:ReloadSkipCache" modifiers="accel,shift"/>
     <key id="key_viewSource" key="&pageSourceCmd.commandkey;" command="View:PageSource" modifiers="accel"/>
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -33,7 +33,6 @@ XPCOMUtils.defineLazyPreferenceGetter(this, "gPhotonStructure",
           LoginManagerParent:false, NewTabUtils:false, PageThumbs:false,
           PluralForm:false, PrivateBrowsingUtils:false,
           ProcessHangMonitor:false, PromiseUtils:false, ReaderMode:false,
-          ReaderParent:false, RecentWindow:false, SafeBrowsing: false,
           SessionStore:false,
           ShortcutUtils:false, SimpleServiceDiscovery:false, SitePermissions:false,
           Social:false, TabCrashHandler:false, TelemetryStopwatch:false,
@@ -74,8 +74,7 @@ XPCOMUtils.defineLazyPreferenceGetter(this, "gPhotonStructure",
   ["PrivateBrowsingUtils", "resource://gre/modules/PrivateBrowsingUtils.jsm"],
   ["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"],
   ["SafeBrowsing", "resource://gre/modules/SafeBrowsing.jsm"],
   ["SessionStore", "resource:///modules/sessionstore/SessionStore.jsm"],
@@ -4788,7 +4785,6 @@ var XULBrowserWindow = {
       }
     }
     UpdateBackForwardCommands(gBrowser.webNavigation);
-    ReaderParent.updateReaderButton(gBrowser.selectedBrowser);
 
     if (!gMultiProcessBrowser) // Bug 1108553 - Cannot rotate images with e10s
       gGestureSupport.restoreRotationState();
--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -888,10 +888,6 @@
                        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
@@ -37,7 +37,6 @@ XPCOMUtils.defineLazyModuleGetter(this, "SafeBrowsing",
           PageActions:false,
           PageThumbs:false, PdfJs:false, PermissionUI:false, PlacesBackups:false,
           PlacesUtils:false, PluralForm:false, PrivateBrowsingUtils:false,
-          ProcessHangMonitor:false, ReaderParent:false, RecentWindow:false,
           RemotePrompt:false, SessionStore:false,
           ShellService:false, SimpleServiceDiscovery:false, TabCrashHandler:false,
           UITour:false, UIState:false, UpdateListener:false, WebChannel:false,
@@ -89,7 +88,6 @@ 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"],
@@ -167,9 +165,6 @@ 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
@@ -30,8 +30,6 @@ XPCOMUtils.defineLazyModuleGetter(this, "PrivateBrowsingUtils",
   "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");
 
@@ -40,7 +38,6 @@ const PREF_LOG_LEVEL      = "browser.uitour.loglevel";
 const PREF_SEENPAGEIDS    = "browser.uitour.seenPageIDs";
 
 const BACKGROUND_PAGE_ACTIONS_ALLOWED = new Set([
-  "forceShowReaderIcon",
   "getConfiguration",
   "getTreatmentTag",
   "hideHighlight",
@@ -205,7 +202,6 @@ this.UITour = {
         return aDocument.getElementById(buttonId);
       }
     }],
-    ["readerMode-urlBar", {query: "#reader-mode-button"}],
     ["search",      {
       infoPanelOffsetX: 18,
       infoPanelPosition: "after_start",
@@ -664,15 +660,10 @@ 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
@@ -85,9 +85,6 @@ with Files("PluginContent.jsm"):
 with Files("ProcessHangMonitor.jsm"):
     BUG_COMPONENT = ("Core", "DOM: Content Processes")
 
-with Files("ReaderParent.jsm"):
-    BUG_COMPONENT = ("Toolkit", "Reader Mode")
-
 with Files("Sanitizer.jsm"):
     BUG_COMPONENT = ("Firefox", "Preferences")
 
@@ -153,7 +150,6 @@ EXTRA_JS_MODULES += [
     'PermissionUI.jsm',
     'PluginContent.jsm',
     'ProcessHangMonitor.jsm',
-    'ReaderParent.jsm',
     'RecentWindow.jsm',
     'RemotePrompt.jsm',
     'Sanitizer.jsm',