diff --git a/src/webdrop_bridge/main.py b/src/webdrop_bridge/main.py
index 1194d69..31e33fc 100644
--- a/src/webdrop_bridge/main.py
+++ b/src/webdrop_bridge/main.py
@@ -7,10 +7,6 @@ import sys
 # This ensures CSS media queries (hover: hover) evaluate correctly for desktop applications
 os.environ["QTWEBENGINE_CHROMIUM_FLAGS"] = "--touch-events=disabled"
 
-# Enable Qt WebEngine Remote Debugging Protocol (Chromium Developer Tools)
-# Allows debugging via browser DevTools at http://localhost:9222 or edge://inspect
-os.environ["QTWEBENGINE_REMOTE_DEBUGGING"] = "9222"
-
 from PySide6.QtWidgets import QApplication
 
 from webdrop_bridge.config import Config, ConfigurationError
diff --git a/src/webdrop_bridge/ui/developer_tools.py b/src/webdrop_bridge/ui/developer_tools.py
index 30cfe61..c44730d 100644
--- a/src/webdrop_bridge/ui/developer_tools.py
+++ b/src/webdrop_bridge/ui/developer_tools.py
@@ -1,9 +1,13 @@
-"""Developer Tools for WebDrop Bridge - using Chromium Remote Debugging Protocol."""
+"""Developer Tools for WebDrop Bridge.
+
+Uses Qt WebEngine's built-in inspector wiring instead of the remote debugging
+HTTP endpoint. This avoids localhost/port timing issues that can differ between
+development runs and frozen MSI installations.
+"""
 
 import logging
 from typing import Any
 
-from PySide6.QtCore import QTimer, QUrl
 from PySide6.QtWebEngineWidgets import QWebEngineView
 from PySide6.QtWidgets import QVBoxLayout, QWidget
 
@@ -15,8 +19,7 @@ __all__ = ["DeveloperToolsWidget"]
 class DeveloperToolsWidget(QWidget):
     """Embedded Chromium Developer Tools Inspector.
 
-    Loads the Chromium DevTools UI using the Remote Debugging Protocol
-    running on localhost:9222.
+    Attaches a dedicated DevTools page directly to the inspected web page.
 
     Features:
     - Real HTML/CSS Inspector with live editing
@@ -45,10 +48,7 @@ class DeveloperToolsWidget(QWidget):
         self.dev_tools_view = QWebEngineView()
         layout.addWidget(self.dev_tools_view)
 
-        # Load DevTools after delay to let debugger start
-        QTimer.singleShot(500, self._load_devtools)
-
-    def _load_devtools(self) -> None:
-        """Load the DevTools targets page from localhost:9222."""
-        logger.info("Loading DevTools from http://localhost:9222")
-        self.dev_tools_view.load(QUrl("http://localhost:9222"))
+        # Directly attach DevTools to the existing page.
+        # This is more robust than relying on the remote debugging HTTP endpoint.
+        self.dev_tools_view.page().setInspectedPage(self.web_view.page())
+        logger.info("Developer Tools attached via QWebEnginePage.setInspectedPage")
diff --git a/tests/unit/test_developer_tools.py b/tests/unit/test_developer_tools.py
new file mode 100644
index 0000000..09f0c58
--- /dev/null
+++ b/tests/unit/test_developer_tools.py
@@ -0,0 +1,16 @@
+"""Unit tests for DeveloperToolsWidget."""
+
+from PySide6.QtWebEngineWidgets import QWebEngineView
+
+from webdrop_bridge.ui.developer_tools import DeveloperToolsWidget
+
+
+def test_developer_tools_widget_attaches_inspected_page(qtbot):
+    """DeveloperToolsWidget should inspect the provided web view page directly."""
+    web_view = QWebEngineView()
+    qtbot.addWidget(web_view)
+
+    dev_tools = DeveloperToolsWidget(web_view)
+    qtbot.addWidget(dev_tools)
+
+    assert dev_tools.dev_tools_view.page().inspectedPage() is web_view.page()