diff --git a/src/renderer/components/settings/NotificationTriggerSettings/utils/trigger.ts b/src/renderer/components/settings/NotificationTriggerSettings/utils/trigger.ts
index e0d42b77..8db17b0d 100644
--- a/src/renderer/components/settings/NotificationTriggerSettings/utils/trigger.ts
+++ b/src/renderer/components/settings/NotificationTriggerSettings/utils/trigger.ts
@@ -2,13 +2,15 @@
  * Utility functions for notification triggers.
  */
 
+import { generateUUID } from '@renderer/utils/uuid';
+
 import type { NotificationTrigger, TriggerContentType, TriggerMode } from '@renderer/types/data';
 
 /**
  * Generates a UUID v4 for new triggers.
  */
 export function generateId(): string {
-  return crypto.randomUUID();
+  return generateUUID();
 }
 
 /**
diff --git a/src/renderer/components/settings/sections/WorkspaceSection.tsx b/src/renderer/components/settings/sections/WorkspaceSection.tsx
index aab157af..6f35d65b 100644
--- a/src/renderer/components/settings/sections/WorkspaceSection.tsx
+++ b/src/renderer/components/settings/sections/WorkspaceSection.tsx
@@ -15,6 +15,7 @@ import { useCallback, useEffect, useState } from 'react';
 import { api } from '@renderer/api';
 import { confirm } from '@renderer/components/common/ConfirmDialog';
 import { useStore } from '@renderer/store';
+import { generateUUID } from '@renderer/utils/uuid';
 import { Edit2, Loader2, Plus, Save, Server, Trash2, X } from 'lucide-react';
 
 import { SettingsSectionHeader } from '../components/SettingsSectionHeader';
@@ -102,7 +103,7 @@ export const WorkspaceSection = (): React.JSX.Element => {
 
   const handleAdd = async (): Promise<void> => {
     const newProfile: SshConnectionProfile = {
-      id: crypto.randomUUID(),
+      id: generateUUID(),
       name: formName.trim(),
       host: formHost.trim(),
       port: parseInt(formPort, 10) || 22,
diff --git a/src/renderer/store/slices/paneSlice.ts b/src/renderer/store/slices/paneSlice.ts
index 85d6628e..73f1368b 100644
--- a/src/renderer/store/slices/paneSlice.ts
+++ b/src/renderer/store/slices/paneSlice.ts
@@ -4,6 +4,7 @@
  */
 
 import { MAX_PANES } from '@renderer/types/panes';
+import { generateUUID } from '@renderer/utils/uuid';
 
 import {
   createEmptyPane,
@@ -140,7 +141,7 @@ export const createPaneSlice: StateCreator<AppState, [], [], PaneSlice> = (set,
     };
 
     // Create new pane with the tab
-    const newPaneId = crypto.randomUUID();
+    const newPaneId = generateUUID();
     const newPane = {
       ...createEmptyPane(newPaneId),
       tabs: [tab],
@@ -277,7 +278,7 @@ export const createPaneSlice: StateCreator<AppState, [], [], PaneSlice> = (set,
       newSourceActiveTabId = newSourceTabs[oldIndex]?.id ?? newSourceTabs[oldIndex - 1]?.id ?? null;
     }
 
-    const newPaneId = crypto.randomUUID();
+    const newPaneId = generateUUID();
     const newPane = {
       ...createEmptyPane(newPaneId),
       tabs: [tab],
diff --git a/src/renderer/store/slices/tabSlice.ts b/src/renderer/store/slices/tabSlice.ts
index 7cb9f4b9..23bdafd7 100644
--- a/src/renderer/store/slices/tabSlice.ts
+++ b/src/renderer/store/slices/tabSlice.ts
@@ -12,6 +12,7 @@ import {
   findTabBySessionAndProject,
   truncateLabel,
 } from '@renderer/types/tabs';
+import { generateUUID } from '@renderer/utils/uuid';
 
 import {
   findPane,
@@ -172,7 +173,7 @@ export const createTabSlice: StateCreator<AppState, [], [], TabSlice> = (set, ge
     // Create new tab with generated id and timestamp
     const newTab: Tab = {
       ...tab,
-      id: crypto.randomUUID(),
+      id: generateUUID(),
       label: truncateLabel(tab.label),
       createdAt: Date.now(),
     };
@@ -365,7 +366,7 @@ export const createTabSlice: StateCreator<AppState, [], [], TabSlice> = (set, ge
     if (!focusedPane) return;
 
     const newTab: Tab = {
-      id: crypto.randomUUID(),
+      id: generateUUID(),
       type: 'dashboard',
       label: 'Dashboard',
       createdAt: Date.now(),
diff --git a/src/renderer/types/tabs.ts b/src/renderer/types/tabs.ts
index 4e60603e..5e08dc71 100644
--- a/src/renderer/types/tabs.ts
+++ b/src/renderer/types/tabs.ts
@@ -3,6 +3,8 @@
  * Based on specs/001-tabbed-layout-dashboard/contracts/tab-state.ts
  */
 
+import { generateUUID } from '@renderer/utils/uuid';
+
 import type { Session } from './data';
 import type { TriggerColor } from '@shared/constants/triggerColors';
 
@@ -52,7 +54,7 @@ export interface SearchNavigationPayload {
  * The nonce ensures repeated clicks produce new navigations.
  */
 export interface TabNavigationRequest {
-  /** Unique nonce per click/action (crypto.randomUUID) */
+  /** Unique nonce per click/action (generateUUID) */
   id: string;
   /** Kind of navigation */
   kind: 'error' | 'search' | 'autoBottom';
@@ -194,7 +196,7 @@ export function createErrorNavigationRequest(
   highlightColor?: TriggerColor
 ): TabNavigationRequest {
   return {
-    id: crypto.randomUUID(),
+    id: generateUUID(),
     kind: 'error',
     source,
     highlight: highlightColor ?? 'red',
@@ -209,7 +211,7 @@ export function createSearchNavigationRequest(
   payload: SearchNavigationPayload
 ): TabNavigationRequest {
   return {
-    id: crypto.randomUUID(),
+    id: generateUUID(),
     kind: 'search',
     source: 'commandPalette',
     highlight: 'yellow',
diff --git a/src/renderer/utils/uuid.ts b/src/renderer/utils/uuid.ts
new file mode 100644
index 00000000..43cf0105
--- /dev/null
+++ b/src/renderer/utils/uuid.ts
@@ -0,0 +1,25 @@
+/**
+ * Generate a UUID v4 string.
+ *
+ * `crypto.randomUUID()` is only available in **secure contexts** (HTTPS or
+ * localhost). When the app is served over plain HTTP on a LAN IP (e.g.
+ * Docker accessed from another machine), the browser will not expose
+ * `randomUUID`. This helper falls back to `crypto.getRandomValues()` which
+ * is available in all modern browsers regardless of secure context.
+ *
+ * @see https://github.com/matt1398/claude-devtools/issues/132
+ */
+export function generateUUID(): string {
+  if (typeof crypto.randomUUID === 'function') {
+    return crypto.randomUUID();
+  }
+
+  // Fallback: construct a v4 UUID from getRandomValues
+  const bytes = crypto.getRandomValues(new Uint8Array(16));
+  // Set version (4) and variant (RFC 4122)
+  bytes[6] = (bytes[6] & 0x0f) | 0x40;
+  bytes[8] = (bytes[8] & 0x3f) | 0x80;
+
+  const hex = Array.from(bytes, (b) => b.toString(16).padStart(2, '0')).join('');
+  return `${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(16, 20)}-${hex.slice(20)}`;
+}