diff --git a/src/App.tsx b/src/App.tsx
index 1a2040a..31574d8 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,4 +1,4 @@
-import { useState, useEffect } from 'react'
+import { useState, useEffect, useCallback } from 'react'
 import './App.css'
 import TraceViewer from './components/TraceViewer'
 import PhaseViewer from './components/PhaseViewer'
@@ -11,6 +11,51 @@ import { useDatabaseTraceData } from './hooks/useDatabaseTraceData'
 
 type AppView = 'trace' | 'phases' | 'http' | 'debug'
 type AppMode = 'selector' | 'upload' | 'analysis'
+type ThreeDView = 'network' | 'timeline' | null
+
+// URL path utilities for /[traceid]/[view]/[3dview] routing
+const updateUrlWithTraceId = (traceId: string | null, view: AppView = 'http', threeDView: ThreeDView = null) => {
+  if (!traceId) {
+    window.history.pushState({}, '', '/')
+    return
+  }
+  
+  const path = threeDView ? `/${traceId}/${view}/${threeDView}` : `/${traceId}/${view}`
+  window.history.pushState({}, '', path)
+}
+
+const getUrlParams = () => {
+  const path = window.location.pathname
+  const segments = path.split('/').filter(Boolean) // Remove empty segments
+  
+  if (segments.length >= 3) {
+    const traceId = segments[0]
+    const view = segments[1] as AppView
+    const threeDView = segments[2] as ThreeDView
+    // Validate view and 3D view values
+    const validViews: AppView[] = ['trace', 'phases', 'http', 'debug']
+    const validThreeDViews: (ThreeDView)[] = ['network', 'timeline']
+    const validatedView = validViews.includes(view) ? view : 'http'
+    const validatedThreeDView = validThreeDViews.includes(threeDView) ? threeDView : null
+    return { traceId, view: validatedView, threeDView: validatedThreeDView }
+  } else if (segments.length >= 2) {
+    const traceId = segments[0]
+    const view = segments[1] as AppView
+    // Validate view is one of the allowed values
+    const validViews: AppView[] = ['trace', 'phases', 'http', 'debug']
+    const validatedView = validViews.includes(view) ? view : 'http'
+    return { traceId, view: validatedView, threeDView: null }
+  } else if (segments.length === 1) {
+    // Only trace ID provided, default to http view
+    return { traceId: segments[0], view: 'http' as AppView, threeDView: null }
+  }
+  
+  // Root path or invalid format
+  return { traceId: null, view: 'http' as AppView, threeDView: null }
+}
+
+// Export utility functions for use in other components
+export { getUrlParams, updateUrlWithTraceId, type ThreeDView }
 
 function App() {
   const [mode, setMode] = useState<AppMode>('selector')
@@ -22,9 +67,27 @@ function App() {
   // Always call hooks at the top level
   const { traceData } = useDatabaseTraceData(selectedTraceId)
 
+  // Handle browser back/forward navigation
+  const handlePopState = useCallback(() => {
+    const { traceId, view } = getUrlParams()
+    if (traceId && traceId !== selectedTraceId) {
+      setSelectedTraceId(traceId)
+      setCurrentView(view)
+      setMode('analysis')
+      // Note: threeDView will be handled by HTTPRequestViewer component
+    } else if (!traceId && selectedTraceId) {
+      setSelectedTraceId(null)
+      setMode('selector')
+    }
+  }, [selectedTraceId])
+
   useEffect(() => {
     initializeApp()
-  }, [])
+    
+    // Listen for browser navigation (back/forward)
+    window.addEventListener('popstate', handlePopState)
+    return () => window.removeEventListener('popstate', handlePopState)
+  }, [handlePopState])
 
   const initializeApp = async () => {
     try {
@@ -36,10 +99,23 @@ function App() {
       const traces = await traceDatabase.getAllTraces()
       setHasTraces(traces.length > 0)
       
-      // If no traces, show upload screen
-      if (traces.length === 0) {
+      // Check URL for existing trace parameter
+      const { traceId, view } = getUrlParams()
+      if (traceId && traces.some(t => t.id === traceId)) {
+        // Valid trace ID in URL, load it
+        setSelectedTraceId(traceId)
+        setCurrentView(view)
+        setMode('analysis')
+        // Note: threeDView will be handled by HTTPRequestViewer component
+      } else if (traceId) {
+        // Invalid trace ID in URL, clear it and show selector
+        window.history.replaceState({}, '', '/')
+        setMode(traces.length > 0 ? 'selector' : 'upload')
+      } else if (traces.length === 0) {
+        // No traces, show upload screen
         setMode('upload')
       } else {
+        // Has traces, show selector
         setMode('selector')
       }
     } catch (error) {
@@ -51,18 +127,23 @@ function App() {
 
   const handleTraceSelect = (traceId: string) => {
     setSelectedTraceId(traceId)
+    setCurrentView('http') // Default to HTTP view
     setMode('analysis')
+    updateUrlWithTraceId(traceId, 'http', null)
   }
 
   const handleUploadSuccess = (traceId: string) => {
     setSelectedTraceId(traceId)
+    setCurrentView('http')
     setMode('analysis')
     setHasTraces(true)
+    updateUrlWithTraceId(traceId, 'http', null)
   }
 
   const handleBackToSelector = () => {
     setSelectedTraceId(null)
     setMode('selector')
+    window.history.pushState({}, '', '/')
   }
 
   const handleUploadNew = () => {
@@ -128,7 +209,10 @@ function App() {
           
           <nav style={{ display: 'flex', gap: '10px' }}>
             <button 
-              onClick={() => setCurrentView('trace')}
+              onClick={() => {
+                setCurrentView('trace')
+                updateUrlWithTraceId(selectedTraceId, 'trace', null)
+              }}
               style={{
                 background: currentView === 'trace' ? '#007bff' : '#6c757d',
                 color: 'white',
@@ -142,7 +226,10 @@ function App() {
               Trace Stats
             </button>
             <button 
-              onClick={() => setCurrentView('phases')}
+              onClick={() => {
+                setCurrentView('phases')
+                updateUrlWithTraceId(selectedTraceId, 'phases', null)
+              }}
               style={{
                 background: currentView === 'phases' ? '#007bff' : '#6c757d',
                 color: 'white',
@@ -156,7 +243,10 @@ function App() {
               Phase Events
             </button>
             <button 
-              onClick={() => setCurrentView('http')}
+              onClick={() => {
+                setCurrentView('http')
+                updateUrlWithTraceId(selectedTraceId, 'http', null)
+              }}
               style={{
                 background: currentView === 'http' ? '#007bff' : '#6c757d',
                 color: 'white',
@@ -170,7 +260,10 @@ function App() {
               HTTP Requests
             </button>
             <button 
-              onClick={() => setCurrentView('debug')}
+              onClick={() => {
+                setCurrentView('debug')
+                updateUrlWithTraceId(selectedTraceId, 'debug', null)
+              }}
               style={{
                 background: currentView === 'debug' ? '#007bff' : '#6c757d',
                 color: 'white',
diff --git a/src/components/httprequestviewer/HTTPRequestViewer.tsx b/src/components/httprequestviewer/HTTPRequestViewer.tsx
index 26e68c1..bed1170 100644
--- a/src/components/httprequestviewer/HTTPRequestViewer.tsx
+++ b/src/components/httprequestviewer/HTTPRequestViewer.tsx
@@ -1,5 +1,6 @@
 import { useState, useMemo, useEffect } from 'react'
 import { useDatabaseTraceData } from '../../hooks/useDatabaseTraceData'
+import { getUrlParams, updateUrlWithTraceId } from '../../App'
 import BabylonViewer from '../../BabylonViewer'
 import BabylonTimelineViewer from '../../BabylonTimelineViewer'
 import RequestFilters from './RequestFilters'
@@ -33,8 +34,42 @@ export default function HTTPRequestViewer({ traceId }: HTTPRequestViewerProps) {
   const [priorityFilter, setPriorityFilter] = useState<string>('all')
   const [showQueueAnalysis, setShowQueueAnalysis] = useState(false)
   const [showScreenshots, setShowScreenshots] = useState(false)
+  // 3D viewer state - initialized from URL
   const [show3DViewer, setShow3DViewer] = useState(false)
   const [showTimelineViewer, setShowTimelineViewer] = useState(false)
+
+  // Initialize 3D view state from URL on component mount and handle URL changes
+  useEffect(() => {
+    const updateFrom3DUrl = () => {
+      const { threeDView } = getUrlParams()
+      setShow3DViewer(threeDView === 'network')
+      setShowTimelineViewer(threeDView === 'timeline')
+    }
+
+    // Set initial state
+    updateFrom3DUrl()
+    
+    // Listen for URL changes (back/forward navigation)
+    const handlePopState = () => updateFrom3DUrl()
+    window.addEventListener('popstate', handlePopState)
+    
+    return () => window.removeEventListener('popstate', handlePopState)
+  }, [])
+
+  // Handle 3D view changes and update URL
+  const handle3DViewerToggle = (enabled: boolean) => {
+    const { traceId, view } = getUrlParams()
+    setShow3DViewer(enabled)
+    setShowTimelineViewer(false) // Ensure only one 3D view is active
+    updateUrlWithTraceId(traceId, view, enabled ? 'network' : null)
+  }
+
+  const handleTimelineViewerToggle = (enabled: boolean) => {
+    const { traceId, view } = getUrlParams()
+    setShowTimelineViewer(enabled)
+    setShow3DViewer(false) // Ensure only one 3D view is active
+    updateUrlWithTraceId(traceId, view, enabled ? 'timeline' : null)
+  }
   const [ssimThreshold, setSsimThreshold] = useState(SSIM_SIMILARITY_THRESHOLD)
   const [pendingSSIMThreshold, setPendingSSIMThreshold] = useState(SSIM_SIMILARITY_THRESHOLD)
   const [expandedRows, setExpandedRows] = useState<Set<string>>(new Set())
@@ -264,8 +299,8 @@ export default function HTTPRequestViewer({ traceId }: HTTPRequestViewerProps) {
         setCurrentPage={setCurrentPage}
         setShowQueueAnalysis={setShowQueueAnalysis}
         setShowScreenshots={setShowScreenshots}
-        setShow3DViewer={setShow3DViewer}
-        setShowTimelineViewer={setShowTimelineViewer}
+        setShow3DViewer={handle3DViewerToggle}
+        setShowTimelineViewer={handleTimelineViewerToggle}
         setPendingSSIMThreshold={setPendingSSIMThreshold}
         handleSSIMRecalculate={handleSSIMRecalculate}
       />
@@ -304,7 +339,7 @@ export default function HTTPRequestViewer({ traceId }: HTTPRequestViewerProps) {
                 3D Network Visualization ({filteredRequests.length} requests)
               </h3>
               <button
-                onClick={() => setShow3DViewer(false)}
+                onClick={() => handle3DViewerToggle(false)}
                 className={styles.modalCloseButton}
               >
                 ✕ Close
@@ -343,7 +378,7 @@ export default function HTTPRequestViewer({ traceId }: HTTPRequestViewerProps) {
                 3D Timeline Visualization ({filteredRequests.length} requests)
               </h3>
               <button
-                onClick={() => setShowTimelineViewer(false)}
+                onClick={() => handleTimelineViewerToggle(false)}
                 className={styles.modalCloseButton}
               >
                 ✕ Close