--- a/dom/base/test/mochitest.ini
+++ b/dom/base/test/mochitest.ini
@@ -650,16 +650,17 @@ skip-if = (toolkit == 'android') # Andro
 [test_iframe_referrer.html]
 [test_iframe_referrer_changing.html]
 [test_iframe_referrer_invalid.html]
 [test_Image_constructor.html]
 [test_img_referrer.html]
 [test_innersize_scrollport.html]
 [test_integer_attr_with_leading_zero.html]
 [test_intersectionobservers.html]
+skip-if = true # Track Bug 1320704
 [test_link_prefetch.html]
 skip-if = !e10s # Track Bug 1281415
 [test_link_stylesheet.html]
 [test_messagemanager_targetchain.html]
 [test_meta_viewport0.html]
 skip-if = (os != 'android')    # meta-viewport tag support is mobile-only
 [test_meta_viewport1.html]
 skip-if = (os != 'android')    # meta-viewport tag support is mobile-only

--- a/dom/tests/mochitest/general/test_interfaces.html
+++ b/dom/tests/mochitest/general/test_interfaces.html
@@ -610,19 +610,19 @@ var interfaceNamesInGlobalScope =
     {name: "ImageCaptureErrorEvent", disabled: true},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "ImageData",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "InputEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "InstallTrigger",
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    "IntersectionObserver",
+    {name: "IntersectionObserver", disabled: true},
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    "IntersectionObserverEntry",
+    {name: "IntersectionObserverEntry", disabled: true},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "KeyEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "KeyboardEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "KeyframeEffectReadOnly", release: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     {name: "KeyframeEffect", release: false},