--- a/browser/components/contextualidentity/test/browser/browser.ini
+++ b/browser/components/contextualidentity/test/browser/browser.ini
@@ -1,9 +1,11 @@
 [DEFAULT]
 skip-if = buildapp == "mulet"
 support-files =
   empty_file.html
   file_reflect_cookie_into_title.html
 
 [browser_usercontext.js]
 [browser_windowName.js]
+tags = openwindow
 [browser_windowOpen.js]
+tags = openwindow
\ No newline at end of file

--- a/browser/components/privatebrowsing/test/browser/browser.ini
+++ b/browser/components/privatebrowsing/test/browser/browser.ini
@@ -1,9 +1,10 @@
 [DEFAULT]
+tags = openwindow
 skip-if = buildapp == "mulet"
 support-files =
   browser_privatebrowsing_concurrent_page.html
   browser_privatebrowsing_geoprompt_page.html
   browser_privatebrowsing_localStorage_before_after_page.html
   browser_privatebrowsing_localStorage_before_after_page2.html
   browser_privatebrowsing_localStorage_page1.html
   browser_privatebrowsing_localStorage_page2.html

--- a/docshell/test/iframesandbox/mochitest.ini
+++ b/docshell/test/iframesandbox/mochitest.ini
@@ -4,17 +4,21 @@ support-files =
   file_our_auxiliary_navigation_by_location.html
   file_parent_navigation_by_location.html
   file_sibling_navigation_by_location.html
   file_top_navigation_by_location.html
   file_top_navigation_by_location_exotic.html
 
 [test_child_navigation_by_location.html]
 [test_other_auxiliary_navigation_by_location.html]
+tags = openwindow
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') #bug 948948, NS_ERROR_FAILURE from nsWindowWatcher::GetPrompt
 [test_our_auxiliary_navigation_by_location.html]
+tags = openwindow
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') #bug 948948, NS_ERROR_FAILURE from nsWindowWatcher::GetPrompt
 [test_parent_navigation_by_location.html]
+tags = openwindow
 [test_sibling_navigation_by_location.html]
+tags = openwindow
 [test_top_navigation_by_location_exotic.html]
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') || android_version == '18' #bug 948948, NS_ERROR_FAILURE from nsWindowWatcher::GetPrompt
 [test_top_navigation_by_location.html]
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') || android_version == '18' #bug 948948, NS_ERROR_FAILURE from nsWindowWatcher::GetPrompt

--- a/docshell/test/navigation/browser.ini
+++ b/docshell/test/navigation/browser.ini
@@ -4,8 +4,9 @@ support-files =
   bug343515_pg2.html
   bug343515_pg3.html
   bug343515_pg3_1.html
   bug343515_pg3_1_1.html
   bug343515_pg3_2.html
 
 [browser_bug343515.js]
 [browser_test-content-chromeflags.js]
+tags = openwindow
\ No newline at end of file

--- a/dom/base/test/mochitest.ini
+++ b/dom/base/test/mochitest.ini
@@ -305,16 +305,17 @@ skip-if = buildapp == 'mulet'
 [test_bug1043106.html]
 [test_bug1060938.html]
 [test_bug1064481.html]
 [test_clearTimeoutIntervalNoArg.html]
 [test_consoleEmptyStack.html]
 [test_constructor-assignment.html]
 [test_constructor.html]
 [test_dialogArguments.html]
+tags = openwindow
 skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android' || e10s # showmodaldialog
 [test_document.all_unqualified.html]
 [test_domcursor.html]
 [test_domrequest.html]
 [test_domwindowutils.html]
 [test_e4x_for_each.html]
 [test_error.html]
 [test_getTranslationNodes.html]
@@ -340,16 +341,17 @@ tags = audiochannel
 tags = audiochannel
 [test_noAudioNotificationOnMutedOrVolume0Element.html]
 tags = audiochannel
 [test_noAudioNotificationOnVolume0Element.html]
 tags = audiochannel
 [test_noWebAudioNotification.html]
 tags = audiochannel
 [test_openDialogChromeOnly.html]
+tags = openwindow
 [test_open_null_features.html]
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') # Fails on b2g-desktop, tracked in bug 1011874
 [test_postMessage_solidus.html]
 [test_pluginAudioNotification.html]
 tags = audiochannel
 skip-if = (buildapp == 'b2g' || buildapp == 'mulet' || toolkit == 'android') # Plugins don't work on Android and/or B2G/Mulet
 [test_screen_orientation.html]
 [test_orientation_alternate.html]

--- a/dom/html/test/mochitest.ini
+++ b/dom/html/test/mochitest.ini
@@ -470,29 +470,36 @@ tags = fullscreen
 skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android' # b2g(time out, some kind of focus issue) b2g-debug(time out, some kind of focus issue) b2g-desktop(time out, some kind of focus issue)
 [test_fullscreen-api-race.html]
 tags = fullscreen
 skip-if = buildapp == 'b2g' || toolkit == 'android' || toolkit == 'cocoa' || e10s # just copy the conditions from the test above
 [test_hidden.html]
 [test_html_attributes_reflection.html]
 [test_htmlcollection.html]
 [test_iframe_sandbox_general.html]
+tags = openwindow
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') #Bug 931116, b2g desktop specific, initial triage
 [test_iframe_sandbox_inheritance.html]
+tags = openwindow
 [test_iframe_sandbox_modal.html]
+tags = openwindow
 skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android' || e10s #modal tests fail on android # b2g(modal tests fail on B2G) b2g-debug(modal tests fail on B2G) b2g-desktop(Bug 931116, b2g desktop specific, initial triage)
 [test_iframe_sandbox_navigation.html]
+tags = openwindow
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') #time out on b2g desktop specific
 [test_iframe_sandbox_navigation2.html]
+tags = openwindow
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') #time out on b2g desktop specific
 [test_iframe_sandbox_plugins.html]
 skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android' # b2g(plugins not supported) b2g-debug(plugins not supported) b2g-desktop(plugins not supported)
 [test_iframe_sandbox_popups.html]
+tags = openwindow
 skip-if = buildapp == 'b2g' # b2g(multiple concurrent window.open()s fail on B2G) b2g-debug(multiple concurrent window.open()s fail on B2G) b2g-desktop(Bug 931116, b2g desktop specific, initial triage)
 [test_iframe_sandbox_popups_inheritance.html]
+tags = openwindow
 skip-if = buildapp == 'b2g' || toolkit == 'android' # b2g(multiple concurrent window.open()s fail on B2G) b2g-debug(multiple concurrent window.open()s fail on B2G) b2g-desktop(Bug 931116, b2g desktop specific, initial triage) android(bug 939642)
 [test_iframe_sandbox_redirect.html]
 [test_iframe_sandbox_refresh.html]
 [test_iframe_sandbox_same_origin.html]
 [test_iframe_sandbox_workers.html]
 [test_img_attributes_reflection.html]
 [test_imageSrcSet.html]
 [test_imports_basics.html]
@@ -591,16 +598,17 @@ support-files = file_cookiemanager.js
 [test_bug765780.html]
 [test_bug871161.html]
 skip-if = (buildapp == 'b2g' && toolkit != 'gonk') #Bug 931116, b2g desktop specific, initial triage
 support-files = file_bug871161-1.html file_bug871161-2.html
 [test_bug1013316.html]
 [test_hash_encoded.html]
 [test_bug1081037.html]
 [test_window_open_close.html]
+tags = openwindow
 skip-if = buildapp == 'b2g' # bug 1129014
 [test_img_complete.html]
 [test_viewport_resize.html]
 [test_image_clone_load.html]
 [test_bug1203668.html]
 [test_bug1166138.html]
 [test_bug1230665.html]
 [test_filepicker_default_directory.html]

--- a/dom/tests/browser/browser.ini
+++ b/dom/tests/browser/browser.ini
@@ -31,16 +31,17 @@ skip-if= buildapp == 'mulet'
 [browser_focus_steal_from_chrome.js]
 skip-if = e10s
 [browser_focus_steal_from_chrome_during_mousedown.js]
 skip-if = e10s
 [browser_frame_elements.js]
 [browser_localStorage_privatestorageevent.js]
 skip-if = e10s
 [browser_test_new_window_from_content.js]
+tags = openwindow
 skip-if = (toolkit == 'android' || buildapp == 'b2g' || buildapp == 'mulet') || (os == "linux" && debug) # see bug 1261495 for Linux debug time outs
 support-files =
   test_new_window_from_content_child.html
 [browser_webapps_permissions.js]
 # TODO: Re-enable permissions tests on Mac, bug 795334
 skip-if = buildapp != "b2g" || e10s
 support-files =
   test-webapp.webapp

--- a/dom/tests/mochitest/bugs/mochitest.ini
+++ b/dom/tests/mochitest/bugs/mochitest.ini
@@ -71,16 +71,17 @@ skip-if = (buildapp == 'b2g' && toolkit 
 [test_bug396843.html]
 skip-if = (buildapp == 'b2g' && (toolkit != 'gonk' || debug))
 [test_bug400204.html]
 [test_bug404748.html]
 [test_bug406375.html]
 skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android'
 [test_bug411103.html]
 [test_bug414291.html]
+tags = openwindow
 [test_bug427744.html]
 skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android'
 [test_bug42976.html]
 [test_bug430276.html]
 [test_bug437361.html]
 skip-if = buildapp == 'mulet' || buildapp == 'b2g' || toolkit == 'android' # b2g(dom.disable_open_during_load not implemented in b2g, showmodaldialog) b2g-debug(dom.disable_open_during_load not implemented in b2g, showmodaldialog) b2g-desktop(dom.disable_open_during_load not implemented in b2g, showmodaldialog)
 [test_bug440572.html]
 [test_bug456151.html]

--- a/dom/tests/mochitest/chrome/chrome.ini
+++ b/dom/tests/mochitest/chrome/chrome.ini
@@ -37,19 +37,21 @@ support-files =
 [test_DOM_element_instanceof.xul]
 [test_activation.xul]
 tags = fullscreen
 [test_bug799299.xul]
 [test_bug800817.xul]
 [test_bug830396.xul]
 [test_bug830858.xul]
 [test_bug1224790-1.xul]
+tags = openwindow
 # synthesizeNativeOSXClick does not work on 10.6
 skip-if = os != 'mac' || os_version == '10.6'
 [test_bug1224790-2.xul]
+tags = openwindow
 # synthesizeNativeOSXClick does not work on 10.6
 skip-if = os != 'mac' || os_version == '10.6'
 [test_callback_wrapping.xul]
 [test_clonewrapper.xul]
 [test_cyclecollector.xul]
 [test_docshell_swap.xul]
 [test_focus.xul]
 skip-if = buildapp == 'mulet'

--- a/dom/workers/test/serviceworkers/mochitest.ini
+++ b/dom/workers/test/serviceworkers/mochitest.ini
@@ -242,16 +242,17 @@ tags = mcb
 [test_not_intercept_plugin.html]
 [test_notification_constructor_error.html]
 [test_notification_get.html]
 [test_notificationclick.html]
 [test_notificationclick_focus.html]
 [test_notificationclick-otherwindow.html]
 [test_opaque_intercept.html]
 [test_openWindow.html]
+tags = openwindow
 [test_origin_after_redirect.html]
 [test_origin_after_redirect_cached.html]
 [test_origin_after_redirect_to_https.html]
 [test_origin_after_redirect_to_https_cached.html]
 [test_post_message.html]
 [test_post_message_advanced.html]
 [test_post_message_source.html]
 [test_register_base.html]

--- a/layout/base/tests/chrome/chrome.ini
+++ b/layout/base/tests/chrome/chrome.ini
@@ -44,16 +44,17 @@ skip-if = buildapp == 'b2g'
 support-files=bug1041200_window.html
 [test_chrome_content_integration.xul]
 skip-if = buildapp == 'b2g'
 [test_chrome_over_plugin.xul]
 skip-if = buildapp == 'mulet' || buildapp == 'b2g'
 [test_default_background.xul]
 skip-if = buildapp == 'b2g'
 [test_dialog_with_positioning.html]
+tags = openwindow
 skip-if = buildapp == 'b2g'
 [test_fixed_bg_scrolling_repaints.html]
 skip-if = buildapp == 'b2g'
 [test_leaf_layers_partition_browser_window.xul]
 skip-if = (!debug) || (toolkit == "cocoa") || (os == "linux") || (buildapp == 'b2g') # Disabled on Mac and Linux because of Bug 992311
 [test_no_clip_iframe.xul]
 skip-if = buildapp == 'b2g'
 [test_passpointerevents.html]

--- a/toolkit/mozapps/extensions/test/browser/browser-common.ini
+++ b/toolkit/mozapps/extensions/test/browser/browser-common.ini
@@ -50,16 +50,17 @@ skip-if = buildapp == 'mulet'
 [browser_manualupdates.js]
 [browser_globalwarnings.js]
 [browser_globalinformations.js]
 [browser_eula.js]
 skip-if = buildapp == 'mulet'
 [browser_updateid.js]
 [browser_purchase.js]
 [browser_openDialog.js]
+tags = openwindow
 skip-if = os == 'win' # Disabled on Windows due to intermittent failures (bug 1135866)
 [browser_types.js]
 [browser_inlinesettings.js]
 [browser_inlinesettings_browser.js]
 [browser_inlinesettings_custom.js]
 [browser_inlinesettings_info.js]
 [browser_tabsettings.js]
 [browser_pluginprefs.js]