diff --git a/dom/browser-element/mochitest/browserElement_PrivateBrowsing.js b/dom/browser-element/mochitest/browserElement_PrivateBrowsing.js
deleted file mode 100644
index 2f4421d7ed3..00000000000
--- a/dom/browser-element/mochitest/browserElement_PrivateBrowsing.js
+++ /dev/null
@@ -1,48 +0,0 @@
-/* Any copyright is dedicated to the public domain.
- http://creativecommons.org/publicdomain/zero/1.0/ */
-
-// Test that the mozprivatebrowsing attribute works.
-"use strict";
-
-SimpleTest.waitForExplicitFinish();
-browserElementTestHelpers.setEnabledPref(true);
-browserElementTestHelpers.addPermission();
-
-function createFrame(aIsPrivate) {
- var iframe = document.createElement("iframe");
- SpecialPowers.wrap(iframe).mozbrowser = true;
- if (aIsPrivate) {
- iframe.setAttribute("mozprivatebrowsing", "true");
- }
- return iframe;
-}
-
-function createTest(aIsPrivate, aExpected, aNext) {
- info("createTest " + aIsPrivate + " " + aExpected);
- var deferred = Promise.defer();
-
- var iframe = createFrame(aIsPrivate);
- document.body.appendChild(iframe);
-
- iframe.addEventListener("mozbrowsershowmodalprompt", function(e) {
- is(e.detail.message, aExpected, "Checking localstorage");
- deferred.resolve();
- });
-
- iframe.src = "file_browserElement_PrivateBrowsing.html";
-
- return deferred.promise;
-}
-
-function runTest() {
- // We first create a iframe in non private browsing mode, set up some
- // localstorage, reopen it to check that we get the previously set value.
- // Finally, open it in private browsing mode and check that localstorage
- // is clear.
- createTest(false, "EMPTY")
- .then(() => { return createTest(false, "bar"); })
- .then(() => { return createTest(true, "EMPTY"); })
- .then(SimpleTest.finish);
-}
-
-addEventListener("testready", runTest);
diff --git a/dom/browser-element/mochitest/file_browserElement_PrivateBrowsing.html b/dom/browser-element/mochitest/file_browserElement_PrivateBrowsing.html
deleted file mode 100644
index 2db63ccf88c..00000000000
--- a/dom/browser-element/mochitest/file_browserElement_PrivateBrowsing.html
+++ /dev/null
@@ -1,10 +0,0 @@
-
-
-
-
-
diff --git a/dom/browser-element/mochitest/mochitest-oop.ini b/dom/browser-element/mochitest/mochitest-oop.ini
index 405687dda6b..5bcd0239d64 100644
--- a/dom/browser-element/mochitest/mochitest-oop.ini
+++ b/dom/browser-element/mochitest/mochitest-oop.ini
@@ -59,7 +59,6 @@ skip-if = (toolkit == 'gonk' && !debug)
[test_browserElement_oop_OpenWindowRejected.html]
skip-if = (toolkit == 'gonk' && !debug)
[test_browserElement_oop_Opensearch.html]
-[test_browserElement_oop_PrivateBrowsing.html]
[test_browserElement_oop_PromptCheck.html]
[test_browserElement_oop_PromptConfirm.html]
[test_browserElement_oop_PurgeHistory.html]
diff --git a/dom/browser-element/mochitest/mochitest.ini b/dom/browser-element/mochitest/mochitest.ini
index 9240a713dc5..9705050f227 100644
--- a/dom/browser-element/mochitest/mochitest.ini
+++ b/dom/browser-element/mochitest/mochitest.ini
@@ -43,7 +43,6 @@ support-files =
browserElement_OpenWindowInFrame.js
browserElement_OpenWindowRejected.js
browserElement_Opensearch.js
- browserElement_PrivateBrowsing.js
browserElement_PromptCheck.js
browserElement_PromptConfirm.js
browserElement_PurgeHistory.js
@@ -90,7 +89,6 @@ support-files =
file_browserElement_OpenWindowDifferentOrigin.html
file_browserElement_OpenWindowInFrame.html
file_browserElement_OpenWindowRejected.html
- file_browserElement_PrivateBrowsing.html
file_browserElement_SecurityChange.html
file_browserElement_SetVisibleFrames2_Outer.html
file_browserElement_SetVisibleFrames_Inner.html
@@ -172,7 +170,6 @@ skip-if = (toolkit == 'gonk' && !debug)
[test_browserElement_inproc_OpenWindowRejected.html]
skip-if = (toolkit == 'gonk' && !debug)
[test_browserElement_inproc_Opensearch.html]
-[test_browserElement_inproc_PrivateBrowsing.html]
[test_browserElement_inproc_PromptCheck.html]
[test_browserElement_inproc_PromptConfirm.html]
[test_browserElement_inproc_PurgeHistory.html]
diff --git a/dom/browser-element/mochitest/test_browserElement_inproc_PrivateBrowsing.html b/dom/browser-element/mochitest/test_browserElement_inproc_PrivateBrowsing.html
deleted file mode 100644
index 0947fd7c71a..00000000000
--- a/dom/browser-element/mochitest/test_browserElement_inproc_PrivateBrowsing.html
+++ /dev/null
@@ -1,19 +0,0 @@
-
-
-
-
- Test for Bug 832700
-
-
-
-
-
-Mozilla Bug 832700
-
-
-
-
-
diff --git a/dom/browser-element/mochitest/test_browserElement_oop_PrivateBrowsing.html b/dom/browser-element/mochitest/test_browserElement_oop_PrivateBrowsing.html
deleted file mode 100644
index 0947fd7c71a..00000000000
--- a/dom/browser-element/mochitest/test_browserElement_oop_PrivateBrowsing.html
+++ /dev/null
@@ -1,19 +0,0 @@
-
-
-
-
- Test for Bug 832700
-
-
-
-
-
-Mozilla Bug 832700
-
-
-
-
-