diff --git a/src/browser/js/Object.zig b/src/browser/js/Object.zig
index 082f135f..c60fe59d 100644
--- a/src/browser/js/Object.zig
+++ b/src/browser/js/Object.zig
@@ -114,11 +114,6 @@ pub fn format(self: Object, writer: *std.Io.Writer) !void {
     return writer.writeAll(str);
 }
 
-pub fn toJson(self: Object, allocator: Allocator) ![]u8 {
-    const json_str_handle = v8.v8__JSON__Stringify(self.ctx.handle, @ptrCast(self.handle), null) orelse return error.JsException;
-    return self.ctx.jsStringToZig(json_str_handle, .{ .allocator = allocator });
-}
-
 pub fn persist(self: Object) !Object {
     var ctx = self.ctx;
 
diff --git a/src/browser/js/Value.zig b/src/browser/js/Value.zig
index cce891a3..a4e28fe4 100644
--- a/src/browser/js/Value.zig
+++ b/src/browser/js/Value.zig
@@ -219,6 +219,11 @@ pub fn toStringZ(self: Value, opts: js.String.ToZigOpts) ![:0]u8 {
     return self._toString(true, opts);
 }
 
+pub fn toJson(self: Value, allocator: Allocator) ![]u8 {
+    const json_str_handle = v8.v8__JSON__Stringify(self.ctx.handle, self.handle, null) orelse return error.JsException;
+    return self.ctx.jsStringToZig(json_str_handle, .{ .allocator = allocator });
+}
+
 fn _toString(self: Value, comptime null_terminate: bool, opts: js.String.ToZigOpts) !(if (null_terminate) [:0]u8 else []u8) {
     const ctx: *js.Context = @constCast(self.ctx);
 
diff --git a/src/browser/tests/history.html b/src/browser/tests/history.html
index 2a6d3957..90df53bf 100644
--- a/src/browser/tests/history.html
+++ b/src/browser/tests/history.html
@@ -35,3 +35,4 @@
 
   history.back();
 </script>
+
diff --git a/src/browser/webapi/History.zig b/src/browser/webapi/History.zig
index 7106be56..124d57b0 100644
--- a/src/browser/webapi/History.zig
+++ b/src/browser/webapi/History.zig
@@ -49,7 +49,7 @@ pub fn setScrollRestoration(self: *History, str: []const u8) void {
     }
 }
 
-pub fn pushState(_: *History, state: js.Object, _: []const u8, _url: ?[]const u8, page: *Page) !void {
+pub fn pushState(_: *History, state: js.Value, _: ?[]const u8, _url: ?[]const u8, page: *Page) !void {
     const arena = page._session.arena;
     const url = if (_url) |u| try arena.dupeZ(u8, u) else try arena.dupeZ(u8, page.url);
 
@@ -57,7 +57,7 @@ pub fn pushState(_: *History, state: js.Object, _: []const u8, _url: ?[]const u8
     _ = try page._session.navigation.pushEntry(url, .{ .source = .history, .value = json }, page, true);
 }
 
-pub fn replaceState(_: *History, state: js.Object, _: []const u8, _url: ?[]const u8, page: *Page) !void {
+pub fn replaceState(_: *History, state: js.Value, _: ?[]const u8, _url: ?[]const u8, page: *Page) !void {
     const arena = page._session.arena;
     const url = if (_url) |u| try arena.dupeZ(u8, u) else try arena.dupeZ(u8, page.url);
 
diff --git a/src/browser/webapi/PerformanceObserver.zig b/src/browser/webapi/PerformanceObserver.zig
index 7e4d9c5d..0b8edd47 100644
--- a/src/browser/webapi/PerformanceObserver.zig
+++ b/src/browser/webapi/PerformanceObserver.zig
@@ -44,7 +44,7 @@ const DefaultDurationThreshold: f64 = 104;
 /// Creates a new PerformanceObserver object with the given observer callback.
 pub fn init(callback: js.Function, page: *Page) !*PerformanceObserver {
     return page._factory.create(PerformanceObserver{
-        ._callback = callback,
+        ._callback = try callback.persist(),
         ._duration_threshold = DefaultDurationThreshold,
         ._interests = 0,
         ._entries = .{},
diff --git a/src/browser/webapi/navigation/Navigation.zig b/src/browser/webapi/navigation/Navigation.zig
index e1afa334..c257d1d2 100644
--- a/src/browser/webapi/navigation/Navigation.zig
+++ b/src/browser/webapi/navigation/Navigation.zig
@@ -247,8 +247,8 @@ pub fn replaceEntry(
 }
 
 const NavigateOptions = struct {
-    state: ?js.Object = null,
-    info: ?js.Object = null,
+    state: ?js.Value = null,
+    info: ?js.Value = null,
     history: ?[]const u8 = null,
 };
 
@@ -346,8 +346,8 @@ pub fn navigate(self: *Navigation, _url: [:0]const u8, _opts: ?NavigateOptions,
 }
 
 pub const ReloadOptions = struct {
-    state: ?js.Object = null,
-    info: ?js.Object = null,
+    state: ?js.Value = null,
+    info: ?js.Value = null,
 };
 
 pub fn reload(self: *Navigation, _opts: ?ReloadOptions, page: *Page) !NavigationReturn {
@@ -371,7 +371,7 @@ pub fn reload(self: *Navigation, _opts: ?ReloadOptions, page: *Page) !Navigation
 }
 
 pub const TraverseToOptions = struct {
-    info: ?js.Object = null,
+    info: ?js.Value = null,
 };
 
 pub fn traverseTo(self: *Navigation, key: []const u8, _opts: ?TraverseToOptions, page: *Page) !NavigationReturn {
@@ -389,7 +389,7 @@ pub fn traverseTo(self: *Navigation, key: []const u8, _opts: ?TraverseToOptions,
 }
 
 pub const UpdateCurrentEntryOptions = struct {
-    state: js.Object,
+    state: js.Value,
 };
 
 pub fn updateCurrentEntry(self: *Navigation, options: UpdateCurrentEntryOptions, page: *Page) !void {