--- a/browser/components/privatebrowsing/content/aboutPrivateBrowsing.js
+++ b/browser/components/privatebrowsing/content/aboutPrivateBrowsing.js
@@ -55,16 +55,28 @@ document.addEventListener("DOMContentLoa
                         .getService(Ci.nsIURLFormatter).formatURLPref;
   document.getElementById("startTour").setAttribute("href",
                      formatURLPref("privacy.trackingprotection.introURL"));
   document.getElementById("learnMore").setAttribute("href",
                      formatURLPref("app.support.baseURL") + "private-browsing");
 
   // Update state that depends on preferences.
   prefObserver.observe();
+
+  // This check can be removed when Tracking Protection is always available.
+  let tpUIEnabled = false;
+  try {
+    tpUIEnabled = Services.prefs.getBoolPref("privacy.trackingprotection.ui.enabled");
+  } catch (ex) {
+    // The preference is not available.
+  }
+  if (!tpUIEnabled) {
+    document.getElementById("trackingProtectionSection")
+            .setAttribute("hidden", "true");
+  }
 }, false);
 
 function openPrivateWindow() {
   // Ask chrome to open a private window
   document.dispatchEvent(
     new CustomEvent("AboutPrivateBrowsingOpenWindow", {bubbles:true}));
 }
 

--- a/browser/components/privatebrowsing/test/browser/browser.ini
+++ b/browser/components/privatebrowsing/test/browser/browser.ini
@@ -12,17 +12,16 @@ support-files =
   browser_privatebrowsing_protocolhandler_page.html
   browser_privatebrowsing_windowtitle_page.html
   head.js
   popup.html
   title.sjs
 
 [browser_privatebrowsing_DownloadLastDirWithCPS.js]
 [browser_privatebrowsing_about.js]
-tags = trackingprotection
 [browser_privatebrowsing_aboutHomeButtonAfterWindowClose.js]
 [browser_privatebrowsing_aboutSessionRestore.js]
 [browser_privatebrowsing_cache.js]
 [browser_privatebrowsing_certexceptionsui.js]
 [browser_privatebrowsing_concurrent.js]
 [browser_privatebrowsing_cookieacceptdialog.js]
 [browser_privatebrowsing_crh.js]
 [browser_privatebrowsing_downloadLastDir.js]

--- a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_about.js
+++ b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_about.js
@@ -41,22 +41,24 @@ function* testLinkOpensUrl({ win, tab, e
      `Clicking ${elementId} opened ${expectedUrl} in the same tab.`);
 }
 
 /**
  * Tests the links in "about:privatebrowsing".
  */
 add_task(function* test_links() {
   // Use full version and change the remote URLs to prevent network access.
+  Services.prefs.setBoolPref("privacy.trackingprotection.ui.enabled", true);
   Services.prefs.setCharPref("app.support.baseURL", "https://example.com/");
   Services.prefs.setCharPref("privacy.trackingprotection.introURL",
                              "https://example.com/tour");
   registerCleanupFunction(function () {
     Services.prefs.clearUserPref("privacy.trackingprotection.introURL");
     Services.prefs.clearUserPref("app.support.baseURL");
+    Services.prefs.clearUserPref("privacy.trackingprotection.ui.enabled");
   });
 
   let { win, tab } = yield openAboutPrivateBrowsing();
 
   yield testLinkOpensTab({ win, tab,
     elementId: "learnMore",
     expectedUrl: "https://example.com/private-browsing",
   });
@@ -70,20 +72,22 @@ add_task(function* test_links() {
 });
 
 /**
  * Tests the action to disable and re-enable Tracking Protection in
  * "about:privatebrowsing".
  */
 add_task(function* test_toggleTrackingProtection() {
   // Use tour version but disable Tracking Protection.
+  Services.prefs.setBoolPref("privacy.trackingprotection.ui.enabled", true);
   Services.prefs.setBoolPref("privacy.trackingprotection.pbmode.enabled",
                              true);
   registerCleanupFunction(function () {
     Services.prefs.clearUserPref("privacy.trackingprotection.pbmode.enabled");
+    Services.prefs.clearUserPref("privacy.trackingprotection.ui.enabled");
   });
 
   let { win, tab } = yield openAboutPrivateBrowsing();
 
   // Set up the observer for the preference change before triggering the action.
   let prefBranch =
       Services.prefs.getBranch("privacy.trackingprotection.pbmode.");
   let waitForPrefChanged = () => new Promise(resolve => {

--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1082,17 +1082,17 @@ pref("content.sink.pending_event_mode", 
 //   2 = openAbused
 pref("privacy.popups.disable_from_plugins", 2);
 
 // send "do not track" HTTP header, disabled by default
 pref("privacy.donottrackheader.enabled",    false);
 // Enforce tracking protection in all modes
 pref("privacy.trackingprotection.enabled",  false);
 // Enforce tracking protection in Private Browsing mode
-pref("privacy.trackingprotection.pbmode.enabled",  true);
+pref("privacy.trackingprotection.pbmode.enabled",  false);
 
 pref("dom.event.contextmenu.enabled",       true);
 pref("dom.event.clipboardevents.enabled",   true);
 #if defined(XP_WIN) && !defined(RELEASE_BUILD)
 pref("dom.event.highrestimestamp.enabled",  true);
 #else
 pref("dom.event.highrestimestamp.enabled",  false);
 #endif