diff --git a/internal/webview/proxy/server_test.go b/internal/webview/proxy/server_test.go
index d30ff863..217de9e8 100644
--- a/internal/webview/proxy/server_test.go
+++ b/internal/webview/proxy/server_test.go
@@ -4,11 +4,13 @@ import (
 	"bufio"
 	"context"
 	"crypto/tls"
+	"errors"
 	"io"
 	"net"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
+	"strings"
 	"sync/atomic"
 	"testing"
 	"time"
@@ -16,6 +18,59 @@ import (
 	"github.com/armon/go-socks5"
 )
 
+func TestRejectedProxyRequests(t *testing.T) {
+	secret := "upstream-password"
+	for _, tc := range []struct {
+		name, method, target string
+		status               int
+	}{
+		{"relative URL", "GET", "/relative", 400},
+		{"unsupported URL", "GET", "ftp://example.com/file", 400},
+		{"invalid CONNECT", "CONNECT", "example.com", 400},
+		{"HTTP selection failure", "GET", "http://example.com/", 502},
+		{"CONNECT selection failure", "CONNECT", "example.com:443", 502},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			s := &Server{selectProxy: func(*http.Request) (*url.URL, error) { return nil, errors.New(secret) }}
+			s.transport = &http.Transport{Proxy: s.selectProxy}
+			defer s.transport.CloseIdleConnections()
+			response := httptest.NewRecorder()
+			s.ServeHTTP(response, httptest.NewRequest(tc.method, tc.target, nil))
+			if response.Code != tc.status || strings.Contains(response.Body.String(), secret) {
+				t.Fatalf("unexpected proxy rejection: %d %q", response.Code, response.Body.String())
+			}
+		})
+	}
+}
+
+func TestTunnelRejectsUnsafeUpstreams(t *testing.T) {
+	rejected := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		http.Error(w, "authentication required", http.StatusProxyAuthRequired)
+	}))
+	defer rejected.Close()
+	secure := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		t.Error("untrusted TLS proxy received a request")
+	}))
+	defer secure.Close()
+	for _, upstream := range []string{"ftp://127.0.0.1", rejected.URL, secure.URL} {
+		t.Run(upstream, func(t *testing.T) {
+			selected, err := url.Parse(upstream)
+			if err != nil {
+				t.Fatal(err)
+			}
+			ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+			defer cancel()
+			conn, err := dialTunnel(ctx, "example.com:443", selected)
+			if conn != nil {
+				conn.Close()
+			}
+			if err == nil {
+				t.Fatal("unsafe upstream unexpectedly accepted")
+			}
+		})
+	}
+}
+
 func TestRoutesAndAuthentication(t *testing.T) {
 	origin := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.Header.Get("Proxy-Authorization") != "" {
diff --git a/ui/flutter/third_party/README.md b/ui/flutter/third_party/README.md
index 9a0d8cc6..b250c9c8 100644
--- a/ui/flutter/third_party/README.md
+++ b/ui/flutter/third_party/README.md
@@ -18,6 +18,8 @@ Local native changes are limited to:
   setting and attach the profile before navigation.
 - `MyCookieManager`: route cookie operations to the requested profile, capturing
   the store per operation so asynchronous calls cannot cross profiles.
+- macOS `FlutterWebViewController`: weakly register profile views so uninstall
+  can release their WKWebViews even when Flutter retains a platform-view wrapper.
 
 `lib/app/rpc/webview_profile.dart` uses the existing plugin method channel and
 serializes these internal settings. No extension JavaScript API is added.
diff --git a/ui/flutter/third_party/flutter_inappwebview_macos/macos/Classes/GopeedProfiles.swift b/ui/flutter/third_party/flutter_inappwebview_macos/macos/Classes/GopeedProfiles.swift
index ca0602f5..8d5ab9b1 100644
--- a/ui/flutter/third_party/flutter_inappwebview_macos/macos/Classes/GopeedProfiles.swift
+++ b/ui/flutter/third_party/flutter_inappwebview_macos/macos/Classes/GopeedProfiles.swift
@@ -7,8 +7,25 @@ import FlutterMacOS
 final class GopeedProfiles {
     private static var proxyURLs: [String: String] = [:]
     private static var stores: [String: WKWebsiteDataStore] = [:]
+    private static var views: [String: NSHashTable<FlutterWebViewController>] = [:]
     static func store(_ identifier: String) -> WKWebsiteDataStore? { stores[identifier] }
 
+    static func register(_ view: FlutterWebViewController, identifier: String) {
+        let profileViews = views[identifier] ?? NSHashTable<FlutterWebViewController>.weakObjects()
+        profileViews.add(view)
+        views[identifier] = profileViews
+    }
+
+    private static func disposeViews(_ identifier: String) {
+        // Flutter may retain a removed platform-view wrapper beyond the frame
+        // boundary. Release its WKWebView now, before deleting the named store.
+        // The host has already closed all pages belonging to this profile.
+        let profileViews = views.removeValue(forKey: identifier)
+        for view in profileViews?.allObjects ?? [] {
+            view.dispose(removeFromSuperview: true)
+        }
+    }
+
     static func prepare(arguments: NSDictionary?, result: @escaping FlutterResult) {
         guard #available(macOS 14.0, iOS 17.0, *),
               let identifier = arguments?["gopeedProfileId"] as? String,
@@ -45,6 +62,7 @@ final class GopeedProfiles {
         }
         // Deleting a named store alone can leave in-process cookie caches.
         // Clear every website data type before releasing/removing the store.
+        disposeViews(identifier)
         let store = stores[identifier] ?? WKWebsiteDataStore(forIdentifier: uuid)
         store.removeData(ofTypes: WKWebsiteDataStore.allWebsiteDataTypes(), modifiedSince: Date.distantPast) {
             stores.removeValue(forKey: identifier)
diff --git a/ui/flutter/third_party/flutter_inappwebview_macos/macos/Classes/InAppWebView/FlutterWebViewController.swift b/ui/flutter/third_party/flutter_inappwebview_macos/macos/Classes/InAppWebView/FlutterWebViewController.swift
index 2caa19c6..7bbb22f6 100755
--- a/ui/flutter/third_party/flutter_inappwebview_macos/macos/Classes/InAppWebView/FlutterWebViewController.swift
+++ b/ui/flutter/third_party/flutter_inappwebview_macos/macos/Classes/InAppWebView/FlutterWebViewController.swift
@@ -68,6 +68,9 @@ public class FlutterWebViewController: NSView, Disposable {
         webView!.settings = settings
         webView!.prepare()
         webView!.windowCreated = true
+        if let identifier = initialSettings["gopeedProfileId"] as? String {
+            GopeedProfiles.register(self, identifier: identifier)
+        }
     }
     
     required init?(coder nsCoder: NSCoder) {