diff --git a/src/screens/GalleryDetail.test.ts b/src/screens/GalleryDetail.test.ts
new file mode 100644
index 0000000..4ab5dd6
--- /dev/null
+++ b/src/screens/GalleryDetail.test.ts
@@ -0,0 +1,22 @@
+import { describe, it, expect, vi } from 'vitest'
+import { openGenerationInBrowser } from './GalleryDetail.js'
+
+describe('openGenerationInBrowser', () => {
+  it('opens the expected generation URL', async () => {
+    const openInBrowser = vi.fn().mockResolvedValue(undefined)
+    const onError = vi.fn()
+
+    await openGenerationInBrowser('gen_123', onError, openInBrowser)
+
+    expect(openInBrowser).toHaveBeenCalledWith('https://www.pixelmuse.studio/g/gen_123')
+    expect(onError).not.toHaveBeenCalled()
+  })
+
+  it('captures open errors without rejecting', async () => {
+    const openInBrowser = vi.fn().mockRejectedValue(new Error('xdg-open not found'))
+    const onError = vi.fn()
+
+    await expect(openGenerationInBrowser('gen_123', onError, openInBrowser)).resolves.toBeUndefined()
+    expect(onError).toHaveBeenCalledWith('xdg-open not found')
+  })
+})
diff --git a/src/screens/GalleryDetail.tsx b/src/screens/GalleryDetail.tsx
index 5953137..5cc08db 100644
--- a/src/screens/GalleryDetail.tsx
+++ b/src/screens/GalleryDetail.tsx
@@ -13,6 +13,19 @@ interface Props {
   back: () => void
 }
 
+export async function openGenerationInBrowser(
+  generationId: string,
+  onError: (message: string) => void,
+  openInBrowser: (target: string) => Promise<unknown> = open,
+): Promise<void> {
+  try {
+    await openInBrowser(`https://www.pixelmuse.studio/g/${generationId}`)
+  } catch (error) {
+    const message = error instanceof Error ? error.message : 'Failed to open browser'
+    onError(message)
+  }
+}
+
 export default function GalleryDetail({ client, generationId, back }: Props) {
   const [generation, setGeneration] = useState<Generation | null>(null)
   const [imagePath, setImagePath] = useState<string | null>(null)
@@ -49,7 +62,7 @@ export default function GalleryDetail({ client, generationId, back }: Props) {
     if (confirming) return
     if (input === 'd') setConfirming(true)
     if (input === 'o' && generation) {
-      open(`https://www.pixelmuse.studio/g/${generation.id}`)
+      void openGenerationInBrowser(generation.id, setError)
     }
   })