--- a/testing/web-platform/meta/presentation-api/controlling-ua/getAvailability_mixedcontent.https.html.ini
+++ b/testing/web-platform/meta/presentation-api/controlling-ua/getAvailability_mixedcontent.https.html.ini
@@ -1,5 +1,6 @@
 [getAvailability_mixedcontent.https.html]
   type: testharness
-  [Calling "getAvailability" with an a priori unauthenticated URL in an HTTPS context throws a SecurityError exception.]
-    expected: FAIL
-
+  prefs: [dom.presentation.enabled: true,
+          dom.presentation.controller.enabled: true,
+          dom.presentation.discovery.enabled: true,
+          dom.presentation.device.name: "Firefox"]

--- a/testing/web-platform/meta/presentation-api/controlling-ua/getAvailability_sandboxing_error.html.ini
+++ b/testing/web-platform/meta/presentation-api/controlling-ua/getAvailability_sandboxing_error.html.ini
@@ -1,5 +1,6 @@
 [getAvailability_sandboxing_error.html]
   type: testharness
-  [Sandboxing: Retrieving display availability from a nested context fails when allow-presentation is not set]
-    expected: FAIL
-
+  prefs: [dom.presentation.enabled: true,
+          dom.presentation.controller.enabled: true,
+          dom.presentation.discovery.enabled: true,
+          dom.presentation.device.name: "Firefox"]

--- a/testing/web-platform/meta/presentation-api/controlling-ua/getAvailability_sandboxing_success.html.ini
+++ b/testing/web-platform/meta/presentation-api/controlling-ua/getAvailability_sandboxing_success.html.ini
@@ -1,5 +1,6 @@
 [getAvailability_sandboxing_success.html]
   type: testharness
-  [Sandboxing: Retrieving display availability from a nested context succeeds when allow-presentation is set]
-    expected: FAIL
-
+  prefs: [dom.presentation.enabled: true,
+          dom.presentation.controller.enabled: true,
+          dom.presentation.discovery.enabled: true,
+          dom.presentation.device.name: "Firefox"]

--- a/testing/web-platform/meta/presentation-api/controlling-ua/reconnectToPresentation_mixedcontent.https.html.ini
+++ b/testing/web-platform/meta/presentation-api/controlling-ua/reconnectToPresentation_mixedcontent.https.html.ini
@@ -1,5 +1,6 @@
 [reconnectToPresentation_mixedcontent.https.html]
   type: testharness
-  [Calling "reconnect" with an a priori unauthenticated URL in an HTTPS context throws a SecurityError exception.]
-    expected: FAIL
-
+  prefs: [dom.presentation.enabled: true,
+          dom.presentation.controller.enabled: true,
+          dom.presentation.discovery.enabled: true,
+          dom.presentation.device.name: "Firefox"]

--- a/testing/web-platform/meta/presentation-api/controlling-ua/reconnectToPresentation_sandboxing_error.html.ini
+++ b/testing/web-platform/meta/presentation-api/controlling-ua/reconnectToPresentation_sandboxing_error.html.ini
@@ -1,5 +1,6 @@
 [reconnectToPresentation_sandboxing_error.html]
   type: testharness
-  [Sandboxing: Reconnecting a presentation from a nested context fails when allow-presentation is not set]
-    expected: FAIL
-
+  prefs: [dom.presentation.enabled: true,
+          dom.presentation.controller.enabled: true,
+          dom.presentation.discovery.enabled: true,
+          dom.presentation.device.name: "Firefox"]

--- a/testing/web-platform/meta/presentation-api/controlling-ua/reconnectToPresentation_sandboxing_success.html.ini
+++ b/testing/web-platform/meta/presentation-api/controlling-ua/reconnectToPresentation_sandboxing_success.html.ini
@@ -1,5 +1,6 @@
 [reconnectToPresentation_sandboxing_success.html]
   type: testharness
-  [Sandboxing: Reconnecting a presentation from a nested context succeeds when allow-presentation is set]
-    expected: FAIL
-
+  prefs: [dom.presentation.enabled: true,
+          dom.presentation.controller.enabled: true,
+          dom.presentation.discovery.enabled: true,
+          dom.presentation.device.name: "Firefox"]