diff --git a/src/browser/js/Origin.zig b/src/browser/js/Origin.zig
index 180cfd84..9dc5857b 100644
--- a/src/browser/js/Origin.zig
+++ b/src/browser/js/Origin.zig
@@ -206,7 +206,7 @@ pub fn createFinalizerCallback(
 pub fn takeover(self: *Origin, original: *Origin) !void {
     const arena = self.arena;
 
-    try self.globals.ensureUnusedCapacity(arena, self.globals.items.len);
+    try self.globals.ensureUnusedCapacity(arena, original.globals.items.len);
     for (original.globals.items) |obj| {
         self.globals.appendAssumeCapacity(obj);
     }
diff --git a/src/browser/webapi/IntersectionObserver.zig b/src/browser/webapi/IntersectionObserver.zig
index b4c07e77..8586a11d 100644
--- a/src/browser/webapi/IntersectionObserver.zig
+++ b/src/browser/webapi/IntersectionObserver.zig
@@ -37,7 +37,6 @@ pub fn registerTypes() []const type {
 
 const IntersectionObserver = @This();
 
-_rc: u8 = 0,
 _arena: Allocator,
 _callback: js.Function.Temp,
 _observing: std.ArrayList(*Element) = .{},
@@ -94,26 +93,14 @@ pub fn init(callback: js.Function.Temp, options: ?ObserverInit, page: *Page) !*I
 }
 
 pub fn deinit(self: *IntersectionObserver, shutdown: bool, session: *Session) void {
-    const rc = self._rc;
-    if (comptime IS_DEBUG) {
-        std.debug.assert(rc != 0);
-    }
-
-    if (rc == 1 or shutdown) {
+    if (shutdown) {
         self._callback.release();
-        if ((comptime IS_DEBUG) and !shutdown) {
-            std.debug.assert(self._observing.items.len == 0);
-        }
         session.releaseArena(self._arena);
-    } else {
-        self._rc = rc - 1;
+    } else if (comptime IS_DEBUG) {
+        std.debug.assert(false);
     }
 }
 
-pub fn acquireRef(self: *IntersectionObserver) void {
-    self._rc += 1;
-}
-
 pub fn observe(self: *IntersectionObserver, target: *Element, page: *Page) !void {
     // Check if already observing this target
     for (self._observing.items) |elem| {
@@ -124,7 +111,6 @@ pub fn observe(self: *IntersectionObserver, target: *Element, page: *Page) !void
 
     // Register with page if this is our first observation
     if (self._observing.items.len == 0) {
-        self._rc += 1;
         try page.registerIntersectionObserver(self);
     }
 
@@ -159,10 +145,6 @@ pub fn unobserve(self: *IntersectionObserver, target: *Element, page: *Page) voi
             break;
         }
     }
-
-    if (self._observing.items.len == 0) {
-        self.deinit(false, page._session);
-    }
 }
 
 pub fn disconnect(self: *IntersectionObserver, page: *Page) void {
@@ -173,13 +155,7 @@ pub fn disconnect(self: *IntersectionObserver, page: *Page) void {
     }
     self._pending_entries.clearRetainingCapacity();
 
-    const observing_count = self._observing.items.len;
     self._observing.clearRetainingCapacity();
-
-    if (observing_count > 0) {
-        self.deinit(false, page._session);
-    }
-
     page.unregisterIntersectionObserver(self);
 }
 
@@ -382,7 +358,6 @@ pub const JsApi = struct {
         pub const name = "IntersectionObserver";
         pub const prototype_chain = bridge.prototypeChain();
         pub var class_id: bridge.ClassId = undefined;
-        pub const weak = true;
         pub const finalizer = bridge.finalizer(IntersectionObserver.deinit);
     };
 
diff --git a/src/browser/webapi/MutationObserver.zig b/src/browser/webapi/MutationObserver.zig
index 8b625fa8..002547e5 100644
--- a/src/browser/webapi/MutationObserver.zig
+++ b/src/browser/webapi/MutationObserver.zig
@@ -39,7 +39,6 @@ pub fn registerTypes() []const type {
 
 const MutationObserver = @This();
 
-_rc: u8 = 0,
 _arena: Allocator,
 _callback: js.Function.Temp,
 _observing: std.ArrayList(Observing) = .{},
@@ -87,26 +86,14 @@ pub fn init(callback: js.Function.Temp, page: *Page) !*MutationObserver {
 }
 
 pub fn deinit(self: *MutationObserver, shutdown: bool, session: *Session) void {
-    const rc = self._rc;
-    if (comptime IS_DEBUG) {
-        std.debug.assert(rc != 0);
-    }
-
-    if (rc == 1 or shutdown) {
+     if (shutdown) {
         self._callback.release();
-        if ((comptime IS_DEBUG) and !shutdown) {
-            std.debug.assert(self._observing.items.len == 0);
-        }
         session.releaseArena(self._arena);
-    } else {
-        self._rc = rc - 1;
+    } else if (comptime IS_DEBUG) {
+        std.debug.assert(false);
     }
 }
 
-pub fn acquireRef(self: *MutationObserver) void {
-    self._rc += 1;
-}
-
 pub fn observe(self: *MutationObserver, target: *Node, options: ObserveOptions, page: *Page) !void {
     const arena = self._arena;
 
@@ -171,7 +158,6 @@ pub fn observe(self: *MutationObserver, target: *Node, options: ObserveOptions,
 
     // Register with page if this is our first observation
     if (self._observing.items.len == 0) {
-        self._rc += 1;
         try page.registerMutationObserver(self);
     }
 
@@ -187,12 +173,7 @@ pub fn disconnect(self: *MutationObserver, page: *Page) void {
     }
     self._pending_records.clearRetainingCapacity();
 
-    const observing_count = self._observing.items.len;
     self._observing.clearRetainingCapacity();
-
-    if (observing_count > 0) {
-        self.deinit(false, page._session);
-    }
     page.unregisterMutationObserver(self);
 }
 
@@ -459,7 +440,6 @@ pub const JsApi = struct {
         pub const name = "MutationObserver";
         pub const prototype_chain = bridge.prototypeChain();
         pub var class_id: bridge.ClassId = undefined;
-        pub const weak = true;
         pub const finalizer = bridge.finalizer(MutationObserver.deinit);
     };