diff --git a/packages/ui/src/features/browser-tabs/BrowserTabStrip.tsx b/packages/ui/src/features/browser-tabs/BrowserTabStrip.tsx
index d9c0a55844..bd52aef08e 100644
--- a/packages/ui/src/features/browser-tabs/BrowserTabStrip.tsx
+++ b/packages/ui/src/features/browser-tabs/BrowserTabStrip.tsx
@@ -41,6 +41,7 @@ import { getLeafPanel } from "@posthog/ui/features/panels/panelStoreHelpers";
 import { useSidebarStore } from "@posthog/ui/features/sidebar/sidebarStore";
 import { taskDetailQuery } from "@posthog/ui/features/tasks/queries";
 import { useTasks } from "@posthog/ui/features/tasks/useTasks";
+import { useIsWorkspaceCloudRun } from "@posthog/ui/features/workspace/useWorkspace";
 import { useAppView } from "@posthog/ui/router/useAppView";
 import { useMutation, useQuery } from "@tanstack/react-query";
 import {
@@ -197,6 +198,11 @@ export function BrowserTabStrip() {
   const channelsEnabled =
     useSidebarStore((s) => s.channelsEnabled) && bluebirdEnabled;
 
+  // A cloud run is read-only, so opening a new tab there makes no sense — hide
+  // the new-tab button and disable its Cmd/Ctrl+T shortcut. Off a task route
+  // params.taskId is undefined, so this is false and the button stays.
+  const isCloudRun = useIsWorkspaceCloudRun(params.taskId);
+
   // The active channel sub-section (artifacts/history/context) is the
   // route segment after the channelId. Null when on the channel home or a
   // non-section route (canvas/task), so a channel-home tab labels by name.
@@ -812,7 +818,11 @@ export function BrowserTabStrip() {
       e.preventDefault();
       handleNewTab();
     },
-    { enableOnFormTags: true, enableOnContentEditable: true },
+    {
+      enableOnFormTags: true,
+      enableOnContentEditable: true,
+      enabled: !isCloudRun,
+    },
   );
 
   // Cmd/Ctrl+W closes the active browser tab. Always preventDefault so Electron
@@ -861,7 +871,7 @@ export function BrowserTabStrip() {
       onCloseOthers={handleCloseOthers}
       onCloseToRight={handleCloseToRight}
       onCloseToLeft={handleCloseToLeft}
-      onNewTab={handleNewTab}
+      onNewTab={isCloudRun ? undefined : handleNewTab}
     />
   );
 }
diff --git a/packages/ui/src/features/browser-tabs/TabStrip.test.tsx b/packages/ui/src/features/browser-tabs/TabStrip.test.tsx
index 7f54d2f152..30b2a1cf3a 100644
--- a/packages/ui/src/features/browser-tabs/TabStrip.test.tsx
+++ b/packages/ui/src/features/browser-tabs/TabStrip.test.tsx
@@ -72,6 +72,11 @@ describe("TabStrip", () => {
     expect(props.onNewTab).toHaveBeenCalledTimes(1);
   });
 
+  it("hides the new-tab button when onNewTab is omitted", () => {
+    setup({ onNewTab: undefined });
+    expect(screen.queryByLabelText("New tab")).toBeNull();
+  });
+
   it("collapses a pinned tab to an icon-only pill without a close affordance", () => {
     setup({
       tabs: [{ ...tabs[0], pinned: true }, tabs[1]],
diff --git a/packages/ui/src/features/browser-tabs/TabStrip.tsx b/packages/ui/src/features/browser-tabs/TabStrip.tsx
index 718ad8045c..1a89f5c3ce 100644
--- a/packages/ui/src/features/browser-tabs/TabStrip.tsx
+++ b/packages/ui/src/features/browser-tabs/TabStrip.tsx
@@ -42,7 +42,9 @@ export interface TabStripProps {
   activeTabId: string | null;
   onSelect: (tabId: string) => void;
   onClose: (tabId: string) => void;
-  onNewTab: () => void;
+  /** When omitted, the trailing new-tab button is hidden (e.g. on read-only
+   * cloud runs, where opening a tab makes no sense). */
+  onNewTab?: () => void;
   onTogglePin: (tabId: string) => void;
   onCloseOthers: (tabId: string) => void;
   onCloseToRight: (tabId: string) => void;
@@ -110,21 +112,23 @@ export function TabStrip({
             onCloseToLeft={onCloseToLeft}
           />
         ))}
-        <Tooltip>
-          <TooltipTrigger
-            render={
-              <Button
-                size="icon-sm"
-                aria-label="New tab"
-                className="no-drag shrink-0"
-                onClick={onNewTab}
-              >
-                <PlusIcon size={14} />
-              </Button>
-            }
-          />
-          <TooltipContent side="bottom">New tab</TooltipContent>
-        </Tooltip>
+        {onNewTab && (
+          <Tooltip>
+            <TooltipTrigger
+              render={
+                <Button
+                  size="icon-sm"
+                  aria-label="New tab"
+                  className="no-drag shrink-0"
+                  onClick={onNewTab}
+                >
+                  <PlusIcon size={14} />
+                </Button>
+              }
+            />
+            <TooltipContent side="bottom">New tab</TooltipContent>
+          </Tooltip>
+        )}
       </Flex>
     </TooltipProvider>
   );