disable.diff

diff --git a/browser/components/touchbar/MacTouchBar.js b/browser/components/touchbar/MacTouchBar.js
--- a/browser/components/touchbar/MacTouchBar.js
+++ b/browser/components/touchbar/MacTouchBar.js
@@ -288,13 +288,16 @@ class TouchBarHelper {
         this.activeUrl = data;
         if (data.startsWith("about:reader")) {
           kBuiltInInputs.ReaderView.disabled = false;
-          this._updateTouchBarInput("ReaderView");
         } else {
           // ReaderView button is disabled on every location change since
           // Reader View must determine if the new page can be Reader Viewed.
           kBuiltInInputs.ReaderView.disabled = true;
-          this._updateTouchBarInput("ReaderView");
         }
+        this._updateTouchBarInput("ReaderView");
+        kBuiltInInputs.Back.disabled = !this.window.gBrowser.canGoBack;
+        this._updateTouchBarInput("Back");
+        kBuiltInInputs.Forward.disabled = !this.window.gBrowser.canGoForward;
+        this._updateTouchBarInput("Forward");
         break;
       case "bookmark-icon-updated":
         data == "starred" ?