diff --git a/interface/resources/qml/hifi/commerce/marketplaceItemTester/MarketplaceItemTester.qml b/interface/resources/qml/hifi/commerce/marketplaceItemTester/MarketplaceItemTester.qml
new file mode 100644
index 0000000000..8f391f24c0
--- /dev/null
+++ b/interface/resources/qml/hifi/commerce/marketplaceItemTester/MarketplaceItemTester.qml
@@ -0,0 +1,290 @@
+//
+//  marketplaceItemTester
+//  qml/hifi/commerce/marketplaceItemTester
+//
+//  Load items not in the marketplace for testing purposes
+//
+//  Created by Zach Fox on 2018-09-05
+//  Copyright 2018 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+import QtQuick 2.5
+import QtQuick.Controls 1.4
+import QtQuick.Controls.Styles 1.4
+import QtQuick.Dialogs 1.0
+import QtQuick.Layouts 1.1
+import Hifi 1.0 as Hifi
+import "../../../styles-uit" as HifiStylesUit
+import "../../../controls-uit" as HifiControlsUit
+
+
+
+Rectangle {
+    id: root
+
+    property string installedApps
+    property var nextResourceObjectId: 0
+    signal sendToScript(var message)
+
+    HifiStylesUit.HifiConstants { id: hifi }
+    ListModel { id: resourceListModel }
+
+    color: hifi.colors.white
+
+    AnimatedImage {
+        id: spinner;
+        source: "spinner.gif"
+        width: 74;
+        height: width;
+        anchors.verticalCenter: parent.verticalCenter;
+        anchors.horizontalCenter: parent.horizontalCenter;
+    }
+
+    function fromScript(message) {
+        switch (message.method) {
+            case "newResourceObjectInTest":
+                var resourceObject = message.resourceObject;
+                resourceListModel.append(resourceObject);
+                spinner.visible = false;
+                break;
+            case "nextObjectIdInTest":
+                nextResourceObjectId = message.id;
+                spinner.visible = false;
+                break;
+        }
+    }
+
+    function buildResourceObj(resource) {
+        resource = resource.trim();
+        var assetType = (resource.match(/\.app\.json$/) ? "application" :
+                         resource.match(/\.fst$/) ? "avatar" :
+                         resource.match(/\.json\.gz$/) ? "content set" :
+                         resource.match(/\.json$/) ? "entity or wearable" :
+                         "unknown");
+        return { "id": nextResourceObjectId++,
+                 "resource": resource,
+                 "assetType": assetType };
+    }
+
+    function installResourceObj(resourceObj) {
+        if ("application" === resourceObj.assetType) {
+            Commerce.installApp(resourceObj.resource);
+        }
+    }
+
+    function addAllInstalledAppsToList() {
+        var i, apps = Commerce.getInstalledApps().split(","), len = apps.length;
+        for(i = 0; i < len - 1; ++i) {
+            if (i in apps) {
+                resourceListModel.append(buildResourceObj(apps[i]));
+            }
+        }
+    }
+
+    function toUrl(resource) {
+        var httpPattern = /^http/i;
+        return httpPattern.test(resource) ? resource : "file:///" + resource;
+    }
+
+    function rezEntity(resource, entityType) {
+        sendToScript({
+            method: 'tester_rezClicked',
+            itemHref: toUrl(resource),
+            itemType: entityType});
+    }
+
+    ListView {
+        anchors.fill: parent
+        anchors.leftMargin: 12
+        anchors.bottomMargin: 40
+        anchors.rightMargin: 12
+        model: resourceListModel
+        spacing: 5
+        interactive: false
+
+        delegate: RowLayout {
+            anchors.left: parent.left
+            width: parent.width
+            spacing: 5
+
+            property var actions: {
+                "forward": function(resource, assetType){
+                    switch(assetType) {
+                        case "application":
+                            Commerce.openApp(resource);
+                            break;
+                        case "avatar":
+                            MyAvatar.useFullAvatarURL(resource);
+                            break;
+                        case "content set":
+                            urlHandler.handleUrl("hifi://localhost/0,0,0");
+                            Commerce.replaceContentSet(toUrl(resource), "");
+                            break;
+                        case "entity":
+                        case "wearable":
+                            rezEntity(resource, assetType);
+                            break;
+                        default:
+                            print("Marketplace item tester unsupported assetType " + assetType);
+                    }
+                },
+                "trash": function(){
+                    if ("application" === assetType) {
+                        Commerce.uninstallApp(resource);
+                    }
+                    sendToScript({
+                        method: "tester_deleteResourceObject",
+                        objectId: resourceListModel.get(index).id});
+                    resourceListModel.remove(index);
+                }
+            }
+
+            Column {
+                Layout.preferredWidth: root.width * .6
+                spacing: 5
+                Text {
+                    text: {
+                        var match = resource.match(/\/([^/]*)$/);
+                        return match ? match[1] : resource;
+                    }
+                    font.pointSize: 12
+                    horizontalAlignment: Text.AlignBottom
+                }
+                Text {
+                    text: resource
+                    font.pointSize: 8
+                    width: root.width * .6
+                    horizontalAlignment: Text.AlignBottom
+                    wrapMode: Text.WrapAnywhere
+                }
+            }
+
+            ComboBox {
+                id: comboBox
+
+                Layout.preferredWidth: root.width * .2
+
+                model: [
+                    "application",
+                    "avatar",
+                    "content set",
+                    "entity",
+                    "wearable",
+                    "unknown"
+                ]
+
+                currentIndex: (("entity or wearable" === assetType) ?
+                    model.indexOf("unknown") : model.indexOf(assetType))
+
+                Component.onCompleted: {
+                    onCurrentIndexChanged.connect(function() {
+                        assetType = model[currentIndex];
+                        sendToScript({
+                            method: "tester_updateResourceObjectAssetType",
+                            objectId: resourceListModel.get(index)["id"],
+                            assetType: assetType });
+                    });
+                }
+            }
+
+            Repeater {
+                model: [ "forward", "trash" ]
+
+                HifiStylesUit.HiFiGlyphs {
+                    property var glyphs: {
+                        "application": hifi.glyphs.install,
+                        "avatar": hifi.glyphs.avatar,
+                        "content set": hifi.glyphs.globe,
+                        "entity": hifi.glyphs.wand,
+                        "trash": hifi.glyphs.trash,
+                        "unknown": hifi.glyphs.circleSlash,
+                        "wearable": hifi.glyphs.hat,
+                    }
+                    text: (("trash" === modelData) ?
+                        glyphs.trash :
+                        glyphs[comboBox.model[comboBox.currentIndex]])
+                    size: ("trash" === modelData) ? 22 : 30
+                    color: hifi.colors.black
+                    horizontalAlignment: Text.AlignHCenter
+                    MouseArea {
+                        anchors.fill: parent
+                        onClicked: {
+                            actions[modelData](resource, comboBox.currentText);
+                        }
+                    }
+                }
+            }
+        }
+
+        headerPositioning: ListView.OverlayHeader
+        header: HifiStylesUit.RalewayRegular {
+            id: rootHeader
+            text: "Marketplace Item Tester"
+            height: 80
+            width: paintedWidth
+            size: 22
+            color: hifi.colors.black
+            anchors.left: parent.left
+            anchors.leftMargin: 12
+        }
+
+        footerPositioning: ListView.OverlayFooter
+        footer: Row {
+            id: rootActions
+            spacing: 20
+            anchors.horizontalCenter: parent.horizontalCenter
+
+            property string currentAction
+            property var actions: {
+                "Load File": function(){
+                    rootActions.currentAction = "load file";
+                    Window.browseChanged.connect(onResourceSelected);
+                    Window.browseAsync("Please select a file (*.app.json *.json *.fst *.json.gz)", "", "Assets (*.app.json *.json *.fst *.json.gz)");
+                },
+                "Load URL": function(){
+                    rootActions.currentAction = "load url";
+                    Window.promptTextChanged.connect(onResourceSelected);
+                    Window.promptAsync("Please enter a URL", "");
+                }
+            }
+
+            function onResourceSelected(resource) {
+                // It is possible that we received the present signal
+                // from something other than our browserAsync window.
+                // Alas, there is nothing we can do about that so charge
+                // ahead as though we are sure the present signal is one
+                // we expect.
+                switch(currentAction) {
+                    case "load file":
+                        Window.browseChanged.disconnect(onResourceSelected);
+                        break
+                    case "load url":
+                        Window.promptTextChanged.disconnect(onResourceSelected);
+                        break;
+                }
+                if (resource) {
+                    var resourceObj = buildResourceObj(resource);
+                    installResourceObj(resourceObj);
+                    sendToScript({
+                        method: 'tester_newResourceObject',
+                        resourceObject: resourceObj });
+                }
+            }
+
+            Repeater {
+                model: [ "Load File", "Load URL" ]
+                HifiControlsUit.Button {
+                    color: hifi.buttons.blue
+                    fontSize: 20
+                    text: modelData
+                    width: root.width / 3
+                    height: 40
+                    onClicked: actions[text]()
+                }
+            }
+        }
+    }
+}
diff --git a/interface/resources/qml/hifi/commerce/marketplaceItemTester/spinner.gif b/interface/resources/qml/hifi/commerce/marketplaceItemTester/spinner.gif
new file mode 100644
index 0000000000..00f75ae62f
Binary files /dev/null and b/interface/resources/qml/hifi/commerce/marketplaceItemTester/spinner.gif differ
diff --git a/interface/resources/qml/hifi/commerce/purchases/PurchasedItem.qml b/interface/resources/qml/hifi/commerce/purchases/PurchasedItem.qml
index 032d9b0199..eeb9ac3c54 100644
--- a/interface/resources/qml/hifi/commerce/purchases/PurchasedItem.qml
+++ b/interface/resources/qml/hifi/commerce/purchases/PurchasedItem.qml
@@ -59,7 +59,7 @@ Item {
 
     Connections {
         target: Commerce;
-        
+
         onContentSetChanged: {
             if (contentSetHref === root.itemHref) {
                 showConfirmation = true;
@@ -135,7 +135,7 @@ Item {
                 anchors.topMargin: 8;
                 width: 30;
                 height: width;
-            
+
                 HiFiGlyphs {
                     id: closeContextMenuGlyph;
                     text: hifi.glyphs.close;
@@ -376,7 +376,7 @@ Item {
                 }
             }
         }
-        
+
         transform: Rotation {
             id: rotation;
             origin.x: flipable.width/2;
@@ -509,7 +509,7 @@ Item {
                     }
                 verticalAlignment: Text.AlignTop;
             }
-        
+
             HiFiGlyphs {
                 id: statusIcon;
                 text: {
@@ -588,7 +588,7 @@ Item {
                 border.width: 1;
                 border.color: "#E2334D";
             }
-            
+
             HiFiGlyphs {
                 id: contextMenuGlyph;
                 text: hifi.glyphs.verticalEllipsis;
@@ -615,7 +615,7 @@ Item {
                 }
             }
         }
-        
+
         Rectangle {
             id: rezzedNotifContainer;
             z: 998;
@@ -663,13 +663,13 @@ Item {
                     Tablet.playSound(TabletEnums.ButtonHover);
                 }
             }
-    
+
             onFocusChanged: {
                 if (focus) {
                     Tablet.playSound(TabletEnums.ButtonHover);
                 }
             }
-            
+
             onClicked: {
                 Tablet.playSound(TabletEnums.ButtonClick);
                 if (root.itemType === "contentSet") {
@@ -775,7 +775,7 @@ Item {
             // Style
             color: hifi.colors.redAccent;
             horizontalAlignment: Text.AlignRight;
-            
+
             MouseArea {
                 anchors.fill: parent;
                 hoverEnabled: true;
diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index ce51f4b5ce..3a34c87ef1 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -1691,21 +1691,21 @@ Application::Application(int& argc, char** argv, QElapsedTimer& startupTimer, bo
         return DependencyManager::get<OffscreenUi>()->navigationFocused() ? 1 : 0;
     });
     _applicationStateDevice->setInputVariant(STATE_PLATFORM_WINDOWS, []() -> float {
-#if defined(Q_OS_WIN) 
+#if defined(Q_OS_WIN)
         return 1;
 #else
         return 0;
 #endif
     });
     _applicationStateDevice->setInputVariant(STATE_PLATFORM_MAC, []() -> float {
-#if defined(Q_OS_MAC) 
+#if defined(Q_OS_MAC)
         return 1;
 #else
         return 0;
 #endif
     });
     _applicationStateDevice->setInputVariant(STATE_PLATFORM_ANDROID, []() -> float {
-#if defined(Q_OS_ANDROID) 
+#if defined(Q_OS_ANDROID)
         return 1;
 #else
         return 0;
@@ -2883,9 +2883,10 @@ void Application::initializeUi() {
         QUrl{ "hifi/commerce/common/CommerceLightbox.qml" },
         QUrl{ "hifi/commerce/common/EmulatedMarketplaceHeader.qml" },
         QUrl{ "hifi/commerce/common/FirstUseTutorial.qml" },
-        QUrl{ "hifi/commerce/common/SortableListModel.qml" },
         QUrl{ "hifi/commerce/common/sendAsset/SendAsset.qml" },
+        QUrl{ "hifi/commerce/common/SortableListModel.qml" },
         QUrl{ "hifi/commerce/inspectionCertificate/InspectionCertificate.qml" },
+        QUrl{ "hifi/commerce/marketplaceItemTester/MarketplaceItemTester.qml"},
         QUrl{ "hifi/commerce/purchases/PurchasedItem.qml" },
         QUrl{ "hifi/commerce/purchases/Purchases.qml" },
         QUrl{ "hifi/commerce/wallet/Help.qml" },
diff --git a/interface/src/commerce/QmlCommerce.cpp b/interface/src/commerce/QmlCommerce.cpp
index 06da18148f..7c5df0f3e3 100644
--- a/interface/src/commerce/QmlCommerce.cpp
+++ b/interface/src/commerce/QmlCommerce.cpp
@@ -199,12 +199,18 @@ void QmlCommerce::transferAssetToUsername(const QString& username,
 }
 
 void QmlCommerce::replaceContentSet(const QString& itemHref, const QString& certificateID) {
-    auto ledger = DependencyManager::get<Ledger>();
-    ledger->updateLocation(certificateID, DependencyManager::get<AddressManager>()->getPlaceName(), true);
+    if (!certificateID.isEmpty()) {
+        auto ledger = DependencyManager::get<Ledger>();
+        ledger->updateLocation(
+            certificateID,
+            DependencyManager::get<AddressManager>()->getPlaceName(),
+            true);
+    }
     qApp->replaceDomainContent(itemHref);
-    QJsonObject messageProperties = { { "status", "SuccessfulRequestToReplaceContent" }, { "content_set_url", itemHref } };
+    QJsonObject messageProperties = {
+        { "status", "SuccessfulRequestToReplaceContent" },
+        { "content_set_url", itemHref } };
     UserActivityLogger::getInstance().logAction("replace_domain_content", messageProperties);
-
     emit contentSetChanged(itemHref);
 }
 
@@ -228,6 +234,7 @@ QString QmlCommerce::getInstalledApps(const QString& justInstalledAppID) {
         // Thus, we protect against deleting the .app.json from the user's disk (below)
         // by skipping that check for the app we just installed.
         if ((justInstalledAppID != "") && ((justInstalledAppID + ".app.json") == appFileName)) {
+            installedAppsFromMarketplace += appFileName + ",";
             continue;
         }
 
diff --git a/scripts/system/commerce/wallet.js b/scripts/system/commerce/wallet.js
index 993ea30c2e..b12191b00c 100644
--- a/scripts/system/commerce/wallet.js
+++ b/scripts/system/commerce/wallet.js
@@ -500,6 +500,35 @@ function walletClosed() {
 //
 // Manage the connection between the button and the window.
 //
+var DEVELOPER_MENU = "Developer";
+var MARKETPLACE_ITEM_TESTER_LABEL = "Marketplace Item Tester";
+var MARKETPLACE_ITEM_TESTER_QML_SOURCE = "hifi/commerce/marketplaceItemTester/MarketplaceItemTester.qml";
+function installMarketplaceItemTester() {
+    if (!Menu.menuExists(DEVELOPER_MENU)) {
+       Menu.addMenu(DEVELOPER_MENU);
+    }
+    if (!Menu.menuItemExists(DEVELOPER_MENU, MARKETPLACE_ITEM_TESTER_LABEL)) {
+        Menu.addMenuItem({ menuName: DEVELOPER_MENU,
+                           menuItemName: MARKETPLACE_ITEM_TESTER_LABEL,
+                           isCheckable: false })
+    }
+
+    Menu.menuItemEvent.connect(function (menuItem) {
+        if (menuItem === MARKETPLACE_ITEM_TESTER_LABEL) {
+            var tablet = Tablet.getTablet("com.highfidelity.interface.tablet.system");
+            tablet.loadQMLSource(MARKETPLACE_ITEM_TESTER_QML_SOURCE);
+        }
+    });
+}
+
+function uninstallMarketplaceItemTester() {
+    if (Menu.menuExists(DEVELOPER_MENU) &&
+        Menu.menuItemExists(DEVELOPER_MENU, MARKETPLACE_ITEM_TESTER_LABEL)
+    ) {
+        Menu.removeMenuItem(DEVELOPER_MENU, MARKETPLACE_ITEM_TESTER_LABEL);
+    }
+}
+
 var BUTTON_NAME = "WALLET";
 var WALLET_QML_SOURCE = "hifi/commerce/wallet/Wallet.qml";
 var ui;
@@ -513,7 +542,9 @@ function startup() {
         onMessage: fromQml
     });
     GlobalServices.myUsernameChanged.connect(onUsernameChanged);
+    installMarketplaceItemTester();
 }
+
 var isUpdateOverlaysWired = false;
 function off() {
     Users.usernameFromIDReply.disconnect(usernameFromIDReply);
@@ -528,9 +559,11 @@ function off() {
     }
     removeOverlays();
 }
+
 function shutdown() {
     GlobalServices.myUsernameChanged.disconnect(onUsernameChanged);
     deleteSendMoneyParticleEffect();
+    uninstallMarketplaceItemTester();
     off();
 }
 
diff --git a/scripts/system/marketplaces/marketplaces.js b/scripts/system/marketplaces/marketplaces.js
index 13ad1f6b69..cc5ff99673 100644
--- a/scripts/system/marketplaces/marketplaces.js
+++ b/scripts/system/marketplaces/marketplaces.js
@@ -20,13 +20,14 @@ var AppUi = Script.require('appUi');
 Script.include("/~/system/libraries/gridTool.js");
 Script.include("/~/system/libraries/connectionUtils.js");
 
-var METAVERSE_SERVER_URL = Account.metaverseServerURL;
-var MARKETPLACES_URL = Script.resolvePath("../html/marketplaces.html");
-var MARKETPLACES_INJECT_SCRIPT_URL = Script.resolvePath("../html/js/marketplacesInject.js");
 var MARKETPLACE_CHECKOUT_QML_PATH = "hifi/commerce/checkout/Checkout.qml";
+var MARKETPLACE_INSPECTIONCERTIFICATE_QML_PATH = "hifi/commerce/inspectionCertificate/InspectionCertificate.qml";
+var MARKETPLACE_ITEM_TESTER_QML_PATH = "hifi/commerce/marketplaceItemTester/MarketplaceItemTester.qml";
 var MARKETPLACE_PURCHASES_QML_PATH = "hifi/commerce/purchases/Purchases.qml";
 var MARKETPLACE_WALLET_QML_PATH = "hifi/commerce/wallet/Wallet.qml";
-var MARKETPLACE_INSPECTIONCERTIFICATE_QML_PATH = "hifi/commerce/inspectionCertificate/InspectionCertificate.qml";
+var MARKETPLACES_INJECT_SCRIPT_URL = Script.resolvePath("../html/js/marketplacesInject.js");
+var MARKETPLACES_URL = Script.resolvePath("../html/marketplaces.html");
+var METAVERSE_SERVER_URL = Account.metaverseServerURL;
 var REZZING_SOUND = SoundCache.getSound(Script.resolvePath("../assets/sounds/rezzing.wav"));
 
 // Event bridge messages.
@@ -756,7 +757,7 @@ function deleteSendAssetParticleEffect() {
     }
     sendAssetRecipient = null;
 }
-    
+
 var savedDisablePreviewOption = Menu.isOptionChecked("Disable Preview");
 var UI_FADE_TIMEOUT_MS = 150;
 function maybeEnableHMDPreview() {
@@ -768,6 +769,13 @@ function maybeEnableHMDPreview() {
     }, UI_FADE_TIMEOUT_MS);
 }
 
+var resourceObjectsInTest = [];
+function signalNewResourceObjectInTest(resourceObject) {
+    ui.tablet.sendToQml({
+        method: "newResourceObjectInTest",
+        resourceObject: resourceObject });
+}
+
 var onQmlMessageReceived = function onQmlMessageReceived(message) {
     if (message.messageSrc === "HTML") {
         return;
@@ -817,8 +825,20 @@ var onQmlMessageReceived = function onQmlMessageReceived(message) {
         break;
     case 'checkout_rezClicked':
     case 'purchases_rezClicked':
+    case 'tester_rezClicked':
         rezEntity(message.itemHref, message.itemType);
         break;
+    case 'tester_newResourceObject':
+        var resourceObject = message.resourceObject;
+        resourceObjectsInTest[resourceObject.id] = resourceObject;
+        signalNewResourceObjectInTest(resourceObject);
+        break;
+    case 'tester_updateResourceObjectAssetType':
+        resourceObjectsInTest[message.objectId].assetType = message.assetType;
+        break;
+    case 'tester_deleteResourceObject':
+        delete resourceObjectsInTest[message.objectId];
+        break;
     case 'header_marketplaceImageClicked':
     case 'purchases_backClicked':
         ui.open(message.referrerURL, MARKETPLACES_INJECT_SCRIPT_URL);
@@ -841,10 +861,6 @@ var onQmlMessageReceived = function onQmlMessageReceived(message) {
         openLoginWindow();
         break;
     case 'disableHmdPreview':
-        if (!savedDisablePreviewOption) {
-            savedDisablePreviewOption = Menu.isOptionChecked("Disable Preview");
-        }
-
         if (!savedDisablePreviewOption) {
             DesktopPreviewProvider.setPreviewDisabledReason("SECURE_SCREEN");
             Menu.setIsOptionChecked("Disable Preview", true);
@@ -962,34 +978,65 @@ var onQmlMessageReceived = function onQmlMessageReceived(message) {
     }
 };
 
+function pushResourceObjectsInTest() {
+    var maxObjectId = -1;
+    for (var objectId in resourceObjectsInTest) {
+        signalNewResourceObjectInTest(resourceObjectsInTest[objectId]);
+        maxObjectId = (maxObjectId < objectId) ? parseInt(objectId) : maxObjectId;
+    }
+    // N.B. Thinking about removing the following sendToQml? Be sure
+    // that the marketplace item tester QML has heard from us, at least
+    // so that it can indicate to the user that all of the resoruce
+    // objects in test have been transmitted to it.
+    ui.tablet.sendToQml({ method: "nextObjectIdInTest", id: maxObjectId + 1 });
+}
+
 // Function Name: onTabletScreenChanged()
 //
 // Description:
 //   -Called when the TabletScriptingInterface::screenChanged() signal is emitted. The "type" argument can be either the string
 //    value of "Home", "Web", "Menu", "QML", or "Closed". The "url" argument is only valid for Web and QML.
-var onMarketplaceScreen = false;
-var onWalletScreen = false;
+
 var onCommerceScreen = false;
 var onInspectionCertificateScreen = false;
+var onMarketplaceItemTesterScreen = false;
+var onMarketplaceScreen = false;
+var onWalletScreen = false;
 var onTabletScreenChanged = function onTabletScreenChanged(type, url) {
     ui.setCurrentVisibleScreenMetadata(type, url);
     onMarketplaceScreen = type === "Web" && url.indexOf(MARKETPLACE_URL) !== -1;
     onInspectionCertificateScreen = type === "QML" && url.indexOf(MARKETPLACE_INSPECTIONCERTIFICATE_QML_PATH) !== -1;
     var onWalletScreenNow = url.indexOf(MARKETPLACE_WALLET_QML_PATH) !== -1;
-    var onCommerceScreenNow = type === "QML" &&
-        (url.indexOf(MARKETPLACE_CHECKOUT_QML_PATH) !== -1 || url === MARKETPLACE_PURCHASES_QML_PATH ||
-        onInspectionCertificateScreen);
+    var onCommerceScreenNow = type === "QML" && (
+        url.indexOf(MARKETPLACE_CHECKOUT_QML_PATH) !== -1 ||
+        url === MARKETPLACE_PURCHASES_QML_PATH ||
+        url.indexOf(MARKETPLACE_INSPECTIONCERTIFICATE_QML_PATH) !== -1);
+    var onMarketplaceItemTesterScreenNow = (
+        url.indexOf(MARKETPLACE_ITEM_TESTER_QML_PATH) !== -1 ||
+        url === MARKETPLACE_ITEM_TESTER_QML_PATH);
 
-    // exiting wallet or commerce screen
-    if ((!onWalletScreenNow && onWalletScreen) || (!onCommerceScreenNow && onCommerceScreen)) {
+    if ((!onWalletScreenNow && onWalletScreen) ||
+        (!onCommerceScreenNow && onCommerceScreen) ||
+        (!onMarketplaceItemTesterScreenNow && onMarketplaceScreen)
+    ) {
+        // exiting wallet, commerce, or marketplace item tester screen
         maybeEnableHMDPreview();
     }
 
     onCommerceScreen = onCommerceScreenNow;
     onWalletScreen = onWalletScreenNow;
-    wireQmlEventBridge(onMarketplaceScreen || onCommerceScreen || onWalletScreen);
+    onMarketplaceItemTesterScreen = onMarketplaceItemTesterScreenNow;
+
+    wireQmlEventBridge(
+        onMarketplaceScreen ||
+        onCommerceScreen ||
+        onWalletScreen ||
+        onMarketplaceItemTesterScreen);
 
     if (url === MARKETPLACE_PURCHASES_QML_PATH) {
+        // FIXME? Is there a race condition here in which the event
+        // bridge may not be up yet? If so, Script.setTimeout(..., 750)
+        // may help avoid the condition.
         ui.tablet.sendToQml({
             method: 'updatePurchases',
             referrerURL: referrerURL,
@@ -1026,6 +1073,14 @@ var onTabletScreenChanged = function onTabletScreenChanged(type, url) {
         });
         off();
     }
+
+    if (onMarketplaceItemTesterScreen) {
+        // Why setTimeout? The QML event bridge, wired above, requires a
+        // variable amount of time to come up, in practice less than
+        // 750ms.
+        Script.setTimeout(pushResourceObjectsInTest, 750);
+    }
+
     console.debug(ui.buttonName + " app reports: Tablet screen changed.\nNew screen type: " + type +
         "\nNew screen URL: " + url + "\nCurrent app open status: " + ui.isOpen + "\n");
 };