diff --git a/browser/components/downloads/test/browser/browser.ini b/browser/components/downloads/test/browser/browser.ini
index 5aa1a5be2ad3..1efa35dc195d 100644
--- a/browser/components/downloads/test/browser/browser.ini
+++ b/browser/components/downloads/test/browser/browser.ini
@@ -10,6 +10,7 @@ skip-if = os == "linux" # Bug 952422
 [browser_iframe_gone_mid_download.js]
 [browser_indicatorDrop.js]
 [browser_libraryDrop.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_downloads_panel_block.js]
 skip-if = true # Bug 1352792
 [browser_downloads_panel_height.js]
diff --git a/browser/components/extensions/test/browser/browser-common.ini b/browser/components/extensions/test/browser/browser-common.ini
index 058a2c27bf65..5a04e33da7b1 100644
--- a/browser/components/extensions/test/browser/browser-common.ini
+++ b/browser/components/extensions/test/browser/browser-common.ini
@@ -85,6 +85,7 @@ skip-if = (os == 'win' && !debug) # bug 1352668
 [browser_ext_devtools_panels_elements.js]
 [browser_ext_devtools_panels_elements_sidebar.js]
 [browser_ext_find.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_ext_geckoProfiler_symbolicate.js]
 [browser_ext_getViews.js]
 [browser_ext_history_redirect.js]
diff --git a/browser/components/places/tests/browser/browser.ini b/browser/components/places/tests/browser/browser.ini
index ccf74e7678e9..f86e5ffc0d67 100644
--- a/browser/components/places/tests/browser/browser.ini
+++ b/browser/components/places/tests/browser/browser.ini
@@ -14,60 +14,88 @@ support-files =
 [browser_0_library_left_pane_migration.js]
 [browser_addBookmarkForFrame.js]
 [browser_bookmark_folder_moveability.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_bookmarklet_windowOpen.js]
 [browser_bookmarks_sidebar_search.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 support-files =
   pageopeningwindow.html
 [browser_bookmarkProperties_addFolderDefaultButton.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_bookmarkProperties_addKeywordForThisSearch.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_bookmarkProperties_addLivemark.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_bookmarkProperties_bookmarkAllTabs.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_bookmarkProperties_cancel.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_bookmarkProperties_editTagContainer.js]
 [browser_bookmarkProperties_readOnlyRoot.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_bookmarksProperties.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_check_correct_controllers.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_click_bookmarks_on_toolbar.js]
 [browser_controller_onDrop_tagFolder.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_controller_onDrop.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_copy_folder_tree.js]
 [browser_copy_query_without_tree.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 subsuite = clipboard
 [browser_cutting_bookmarks.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 subsuite = clipboard
 [browser_drag_bookmarks_on_toolbar.js]
 [browser_forgetthissite_single.js]
 [browser_history_sidebar_search.js]
 [browser_library_batch_delete.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_library_commands.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_library_delete_bookmarks_in_tags.js]
 [browser_library_delete_tags.js]
 [browser_library_downloads.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_library_infoBox.js]
 [browser_library_left_pane_fixnames.js]
 [browser_library_left_pane_middleclick.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_library_left_pane_select_hierarchy.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_library_middleclick.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_library_move_bookmarks.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_library_open_leak.js]
 [browser_library_openFlatContainer.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_library_panel_leak.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_library_search.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_library_views_liveupdate.js]
 [browser_markPageAsFollowedLink.js]
 [browser_paste_bookmarks.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 subsuite = clipboard
 [browser_paste_into_tags.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 subsuite = clipboard
 [browser_sidebarpanels_click.js]
 skip-if = true # temporarily disabled for breaking the treeview - bug 658744
 [browser_sort_in_library.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [browser_stayopenmenu.js]
 skip-if = os == "mac" && debug # bug 1400323
 [browser_toolbar_drop_text.js]
 [browser_toolbar_overflow.js]
 [browser_toolbarbutton_menu_context.js]
 [browser_views_iconsupdate.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 support-files =
   favicon-normal16.png
 [browser_views_liveupdate.js]
diff --git a/browser/components/places/tests/chrome/chrome.ini b/browser/components/places/tests/chrome/chrome.ini
index d7b4a55c8e25..b07430313438 100644
--- a/browser/components/places/tests/chrome/chrome.ini
+++ b/browser/components/places/tests/chrome/chrome.ini
@@ -4,12 +4,16 @@ support-files = head.js
 [test_0_bug510634.xul]
 [test_0_multiple_left_pane.xul]
 [test_bug1163447_selectItems_through_shortcut.xul]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [test_bug427633_no_newfolder_if_noip.xul]
 [test_bug485100-change-case-loses-tag.xul]
 [test_bug549192.xul]
 [test_bug549491.xul]
 [test_bug631374_tags_selector_scroll.xul]
 [test_editBookmarkOverlay_keywords.xul]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [test_editBookmarkOverlay_tags_liveUpdate.xul]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [test_selectItems_on_nested_tree.xul]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [test_treeview_date.xul]
diff --git a/browser/components/places/tests/unit/xpcshell.ini b/browser/components/places/tests/unit/xpcshell.ini
index a3b1771ae938..465ed4c09a5e 100644
--- a/browser/components/places/tests/unit/xpcshell.ini
+++ b/browser/components/places/tests/unit/xpcshell.ini
@@ -23,3 +23,4 @@ support-files =
 [test_leftpane_corruption_handling.js]
 [test_PUIU_batchUpdatesForNode.js]
 [test_PUIU_makeTransaction.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
diff --git a/browser/modules/test/browser/browser.ini b/browser/modules/test/browser/browser.ini
index c8cf8c19c480..a647fed35e4e 100644
--- a/browser/modules/test/browser/browser.ini
+++ b/browser/modules/test/browser/browser.ini
@@ -28,7 +28,7 @@ skip-if = !e10s
 [browser_SitePermissions_expiry.js]
 [browser_SitePermissions_tab_urls.js]
 [browser_taskbar_preview.js]
-skip-if = os != "win"
+skip-if = os != "win" || (os == 'win' && ccov) # Bug 1423667
 [browser_UnsubmittedCrashHandler.js]
 run-if = crashreporter
 [browser_urlBar_zoom.js]
diff --git a/dom/browser-element/mochitest/chrome.ini b/dom/browser-element/mochitest/chrome.ini
index 62d2da74933d..d4e37bfcc8ed 100644
--- a/dom/browser-element/mochitest/chrome.ini
+++ b/dom/browser-element/mochitest/chrome.ini
@@ -36,6 +36,7 @@ support-files =
 [test_browserElement_inproc_DOMRequestError.html]
 [test_browserElement_inproc_ExecuteScript.html]
 [test_browserElement_inproc_Find.html]
+fail-if = (os == 'win' && ccov) # Bug 1423667
 [test_browserElement_inproc_GetContentDimensions.html]
 [test_browserElement_inproc_GetScreenshot.html]
 [test_browserElement_inproc_GetScreenshotDppx.html]
diff --git a/netwerk/test/unit/xpcshell.ini b/netwerk/test/unit/xpcshell.ini
index 1901da2d26cf..b65b4b190330 100644
--- a/netwerk/test/unit/xpcshell.ini
+++ b/netwerk/test/unit/xpcshell.ini
@@ -120,6 +120,7 @@ requesttimeoutfactor = 2
 [test_bug380994.js]
 [test_bug388281.js]
 [test_bug396389.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [test_bug401564.js]
 [test_bug411952.js]
 [test_bug412945.js]
@@ -249,6 +250,7 @@ run-sequentially = node server exceptions dont replay well
 [test_multipart_streamconv_missing_boundary_lead_dashes.js]
 [test_multipart_streamconv-byte-by-byte.js]
 [test_nestedabout_serialize.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [test_net_addr.js]
 # Bug 732363: test fails on windows for unknown reasons.
 skip-if = os == "win"
@@ -303,7 +305,7 @@ fail-if = os == "android"
 # This used to be hasNode, but that caused too many issues with tests being
 # silently disabled, so now we explicitly call out the platforms not known
 # to have node installed.
-skip-if = os == "android"
+skip-if = (os == "android") || (os == 'win' && ccov) # Bug 1423667
 run-sequentially = node server exceptions dont replay well
 [test_altsvc.js]
 # This used to be hasNode, but that caused too many issues with tests being
diff --git a/toolkit/components/places/tests/queries/xpcshell.ini b/toolkit/components/places/tests/queries/xpcshell.ini
index fbaa4df50bc6..8a75a4d8adcc 100644
--- a/toolkit/components/places/tests/queries/xpcshell.ini
+++ b/toolkit/components/places/tests/queries/xpcshell.ini
@@ -6,6 +6,7 @@ skip-if = toolkit == 'android'
 [test_abstime-annotation-domain.js]
 [test_abstime-annotation-uri.js]
 [test_async.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [test_containersQueries_sorting.js]
 [test_history_queries_tags_liveUpdate.js]
 [test_history_queries_titles_liveUpdate.js]
diff --git a/toolkit/components/places/tests/unit/xpcshell.ini b/toolkit/components/places/tests/unit/xpcshell.ini
index 761893a52e91..c5a697031762 100644
--- a/toolkit/components/places/tests/unit/xpcshell.ini
+++ b/toolkit/components/places/tests/unit/xpcshell.ini
@@ -26,6 +26,7 @@ support-files =
 [test_317472.js]
 [test_331487.js]
 [test_384370.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [test_385397.js]
 [test_399264_query_to_string.js]
 [test_399264_string_to_query.js]
@@ -63,8 +64,10 @@ skip-if = os == "linux"
 skip-if = (os == "win" && os_version == "5.1") # Bug 1158887
 [test_bookmark_catobs.js]
 [test_bookmarks_json.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [test_bookmarks_json_corrupt.js]
 [test_bookmarks_html.js]
+skip-if = (os == 'win' && ccov) # Bug 1423667
 [test_bookmarks_html_corrupt.js]
 [test_bookmarks_html_escape_entities.js]
 [test_bookmarks_html_import_tags.js]
diff --git a/toolkit/content/tests/chrome/chrome.ini b/toolkit/content/tests/chrome/chrome.ini
index b9831ccd7be0..a0699e5802a6 100644
--- a/toolkit/content/tests/chrome/chrome.ini
+++ b/toolkit/content/tests/chrome/chrome.ini
@@ -82,6 +82,9 @@ skip-if = os == 'linux' # Bug 1264604
 [test_bug418874.xul]
 [test_bug429723.xul]
 [test_bug437844.xul]
+[test_bug451540.xul]
+support-files = bug451540_window.xul
+fail-if = (os == 'win' && ccov) # Bug 1423667
 [test_bug457632.xul]
 [test_bug460942.xul]
 [test_bug471776.xul]
@@ -104,6 +107,7 @@ skip-if = toolkit == "cocoa"
 [test_deck.xul]
 [test_dialogfocus.xul]
 [test_findbar.xul]
+fail-if = (os == 'win' && ccov) # Bug 1423667
 subsuite = clipboard
 [test_findbar_entireword.xul]
 [test_findbar_events.xul]
@@ -194,8 +198,6 @@ skip-if = toolkit == "cocoa"
 [test_chromemargin.xul]
 support-files = window_chromemargin.xul
 skip-if = toolkit == "cocoa"
-[test_bug451540.xul]
-support-files = bug451540_window.xul
 [test_autocomplete_mac_caret.xul]
 skip-if = toolkit != "cocoa"
 [test_cursorsnap.xul]