diff --git a/dom/base/test/mochitest.ini b/dom/base/test/mochitest.ini
index 611da9b081f8..6725abf1f4c8 100644
--- a/dom/base/test/mochitest.ini
+++ b/dom/base/test/mochitest.ini
@@ -653,7 +653,7 @@ skip-if = (toolkit == 'android') # Android: Bug 775227
 [test_innersize_scrollport.html]
 [test_integer_attr_with_leading_zero.html]
 [test_intersectionobservers.html]
-skip-if = true # Track Bug 1320704
+skip-if = (os == "android") # Timing issues
 [test_link_prefetch.html]
 skip-if = !e10s # Track Bug 1281415
 [test_link_stylesheet.html]
diff --git a/dom/tests/mochitest/general/test_interfaces.js b/dom/tests/mochitest/general/test_interfaces.js
index 1f335903b4da..6e17077cdef5 100644
--- a/dom/tests/mochitest/general/test_interfaces.js
+++ b/dom/tests/mochitest/general/test_interfaces.js
@@ -596,9 +596,9 @@ var interfaceNamesInGlobalScope =
 // 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!
-    {name: "IntersectionObserver", disabled: true},
+    "IntersectionObserver",
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    {name: "IntersectionObserverEntry", disabled: true},
+    "IntersectionObserverEntry",
 // 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!
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index fc2160ac4316..33323138017a 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -5670,7 +5670,7 @@ pref("browser.storageManager.pressureNotification.usageThresholdGB", 5);
 // when the page is reloaded. To turn this feature off, just set the limit to 0.
 pref("prompts.authentication_dialog_abuse_limit", 3);
 
-pref("dom.IntersectionObserver.enabled", false);
+pref("dom.IntersectionObserver.enabled", true);
 
 // Whether module scripts (<script type="module">) are enabled for content.
 pref("dom.moduleScripts.enabled", false);