diff --git a/src/WebKit/Enums.cs b/src/WebKit/Enums.cs
index 11603b6d249e..ea8904a06fb6 100644
--- a/src/WebKit/Enums.cs
+++ b/src/WebKit/Enums.cs
@@ -14,7 +14,8 @@ public enum DomCssRuleType : ushort {
 		Page = 6,
 		Variables = 7,
 		WebKitKeyFrames = 8,
-		WebKitKeyFrame = 9
+		WebKitKeyFrame = 9,
+		NamespaceRule = 10,
 	}
 
 	public enum DomCssValueType : ushort {
diff --git a/src/appkit.cs b/src/appkit.cs
index 347d5802babb..4a8d00f00818 100644
--- a/src/appkit.cs
+++ b/src/appkit.cs
@@ -11969,7 +11969,7 @@ partial interface NSRulerView {
 		bool IsFlipped { get; }
 
 		//Detected properties
-		[Export ("scrollView")]
+		[Export ("scrollView", ArgumentSemantic.Weak)]
 		NSScrollView ScrollView { get; set; }
 
 		[Export ("orientation")]
@@ -11990,7 +11990,7 @@ partial interface NSRulerView {
 		[Export ("originOffset")]
 		nfloat OriginOffset { get; set; }
 
-		[Export ("clientView")]
+		[Export ("clientView", ArgumentSemantic.Weak)]
 		NSView ClientView { get; set; }
 
 		[Export ("markers", ArgumentSemantic.Copy), NullAllowed]
diff --git a/src/safariservices.cs b/src/safariservices.cs
index 5c8b6be10606..66cc5d49eae9 100644
--- a/src/safariservices.cs
+++ b/src/safariservices.cs
@@ -18,6 +18,8 @@
 #endif
 
 namespace XamCore.SafariServices {
+	delegate void SFExtensionValidationHandler (bool shouldHide, NSString text);
+
 	[Mac (10,12, onlyOn64: true)][iOS (10,0)]
 	[BaseType (typeof(NSObject))]
 	interface SFContentBlockerState
@@ -128,6 +130,11 @@ interface SFSafariApplication
 		[Static]
 		[Export ("showPreferencesForExtensionWithIdentifier:completionHandler:")]
 		void ShowPreferencesForExtension (string identifier, [NullAllowed] Action<NSError> completionHandler);
+
+		[Mac (10, 12, 4)]
+		[Static][Async]
+		[Export ("dispatchMessageWithName:toExtensionWithIdentifier:userInfo:completionHandler:")]
+		void DispatchMessage (string messageName, string identifier, [NullAllowed] NSDictionary<NSString, NSObject> userInfo, [NullAllowed] Action<NSError> completionHandler);
 	}
 
 	[Mac (10,12, onlyOn64 : true)]
@@ -171,6 +178,14 @@ interface SFSafariExtensionHandling
 
 		[Export ("popoverViewController")]
 		SFSafariExtensionViewController PopoverViewController { get; }
+
+		[Mac (10, 12, 4)]
+		[Async (ResultTypeName="SFExtensionValidationResult")][Export ("validateContextMenuItemWithCommand:inPage:userInfo:validationHandler:")]
+		void ValidateContextMenuItem (string command, SFSafariPage page, [NullAllowed] NSDictionary<NSString, NSObject> userInfo, SFExtensionValidationHandler validationHandler);
+
+		[Mac (10, 12, 4)]
+		[Export ("messageReceivedFromContainingAppWithName:userInfo:")]
+		void MessageReceivedFromContainingApp (string messageName, [NullAllowed] NSDictionary<NSString, NSObject> userInfo);
 	}
 
 	[Mac (10,12, onlyOn64: true)]
@@ -215,6 +230,18 @@ interface SFSafariToolbarItem
 	{
 		[Export ("setEnabled:withBadgeText:")]
 		void SetEnabled (bool enabled, [NullAllowed] string badgeText);
+
+		[Mac (10, 12, 4)]
+		[Export ("setEnabled:")]
+		void SetEnabled (bool enabled);
+
+		[Mac (10, 12, 4)]
+		[Export ("setBadgeText:")]
+		void SetBadgeText ([NullAllowed] string badgeText);
+
+		[Mac (10, 12, 4)]
+		[Export ("setImage:")]
+		void SetImage ([NullAllowed] NSImage image);
 	}
 
 	[Mac (10,12, onlyOn64: true)]