diff --git a/dom/permission/tests/test_permissions_api.html b/dom/permission/tests/test_permissions_api.html
index c936b46e91a..5cced3597af 100644
--- a/dom/permission/tests/test_permissions_api.html
+++ b/dom/permission/tests/test_permissions_api.html
@@ -31,14 +31,6 @@ const UNSUPPORTED_PERMISSIONS = [
   'midi'
 ];
 
-function setup() {
-  return new Promise((resolve, reject) => {
-    SpecialPowers.pushPrefEnv({'set': [
-      ['dom.permissions.enabled', true],
-    ]}, resolve);
-  });
-}
-
 function setPermissions(action) {
   let permissions = PERMISSIONS.map(x => {
     return { 'type': x.perm, 'allow': action, 'context': document };
@@ -111,8 +103,7 @@ function testInvalidQuery() {
 }
 
 function runTests() {
-  setup()
-    .then(checkUnsupportedPermissions)
+  checkUnsupportedPermissions()
     .then(checkUserVisiblePushPermission)
     .then(() => setPermissions(UNKNOWN_ACTION))
     .then(() => checkPermissions('prompt'))
diff --git a/dom/webidl/Navigator.webidl b/dom/webidl/Navigator.webidl
index cb08be68149..74ee74909e5 100644
--- a/dom/webidl/Navigator.webidl
+++ b/dom/webidl/Navigator.webidl
@@ -100,7 +100,7 @@ interface NavigatorFeatures {
 };
 
 partial interface Navigator {
-  [Throws, Pref="dom.permissions.enabled"]
+  [Throws]
   readonly attribute Permissions permissions;
 };
 
diff --git a/dom/webidl/PermissionStatus.webidl b/dom/webidl/PermissionStatus.webidl
index 27ae490c391..3abfd66f407 100644
--- a/dom/webidl/PermissionStatus.webidl
+++ b/dom/webidl/PermissionStatus.webidl
@@ -13,8 +13,7 @@ enum PermissionState {
   "prompt"
 };
 
-[Exposed=(Window),
- Pref="dom.permissions.enabled"]
+[Exposed=(Window)]
 interface PermissionStatus : EventTarget {
   readonly attribute PermissionState state;
   attribute EventHandler onchange;
diff --git a/dom/webidl/Permissions.webidl b/dom/webidl/Permissions.webidl
index 776a22ff843..17574c75e59 100644
--- a/dom/webidl/Permissions.webidl
+++ b/dom/webidl/Permissions.webidl
@@ -22,8 +22,7 @@ dictionary PushPermissionDescriptor : PermissionDescriptor {
   boolean userVisible = false;
 };
 
-[Exposed=(Window),
- Pref="dom.permissions.enabled"]
+[Exposed=(Window)]
 interface Permissions {
   [Throws]
   Promise<PermissionStatus> query(object permission);
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index e09bbb2e223..d513194bff5 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -129,9 +129,6 @@ pref("dom.indexedDB.logging.profiler-marks", false);
 // Whether or not File Handle is enabled.
 pref("dom.fileHandle.enabled", true);
 
-// Whether or not the Permissions API is enabled.
-pref("dom.permissions.enabled", true);
-
 // Whether or not selection events are enabled
 #ifdef NIGHTLY_BUILD
 pref("dom.select_events.enabled", true);