diff --git a/src/main/browser/popup-origin-bar-window.test.ts b/src/main/browser/popup-origin-bar-window.test.ts
index fedcd4dfdd0..48d2e962eae 100644
--- a/src/main/browser/popup-origin-bar-window.test.ts
+++ b/src/main/browser/popup-origin-bar-window.test.ts
@@ -64,16 +64,31 @@ const { fakeElectron } = vi.hoisted(() => {
     }
   }
 
+  class FakeContentView {
+    private handlers = new Map<string, Handler[]>()
+    addChildView = vi.fn()
+    on(event: string, handler: Handler): void {
+      this.handlers.set(event, [...(this.handlers.get(event) ?? []), handler])
+    }
+    emit(event: string): void {
+      for (const handler of this.handlers.get(event) ?? []) {
+        handler()
+      }
+    }
+  }
+
   class FakeBaseWindow {
     static instances: FakeBaseWindow[] = []
     options: Record<string, unknown>
     private handlers = new Map<string, Handler[]>()
-    contentView = { addChildView: vi.fn() }
+    contentView = new FakeContentView()
+    contentSize: { width: number; height: number }
     setTitle = vi.fn()
     isDestroyed = vi.fn(() => false)
     close = vi.fn(() => this.emit('closed'))
     constructor(options: Record<string, unknown>) {
       this.options = options
+      this.contentSize = { width: Number(options.width), height: Number(options.height) }
       FakeBaseWindow.instances.push(this)
     }
     on(event: string, handler: Handler): void {
@@ -83,12 +98,7 @@ const { fakeElectron } = vi.hoisted(() => {
       this.on(event, handler)
     }
     getContentBounds(): { x: number; y: number; width: number; height: number } {
-      return {
-        x: 0,
-        y: 0,
-        width: this.options.width as number,
-        height: this.options.height as number
-      }
+      return { x: 0, y: 0, ...this.contentSize }
     }
     emit(event: string, ...args: unknown[]): void {
       for (const handler of this.handlers.get(event) ?? []) {
@@ -203,7 +213,8 @@ describe('openPopupWithOriginBar', () => {
 
     expect(lastWindow().options).toMatchObject({
       width: 500,
-      height: 400 + POPUP_ORIGIN_BAR_HEIGHT
+      height: 400 + POPUP_ORIGIN_BAR_HEIGHT,
+      autoHideMenuBar: true
     })
     const { bar, content } = lastViews()
     expect(bar.setBounds).toHaveBeenCalledWith({
@@ -220,6 +231,24 @@ describe('openPopupWithOriginBar', () => {
     })
   })
 
+  it('re-lays out when the revealed menu bar shrinks the content area', () => {
+    openPopupWithOriginBar(
+      { webContents: createFakeWebContents() as never, width: 500, height: 400 },
+      'https://example.com/'
+    )
+    const window = lastWindow()
+    const menuBarHeight = 25
+    window.contentSize = { width: 500, height: 400 + POPUP_ORIGIN_BAR_HEIGHT - menuBarHeight }
+    window.contentView.emit('bounds-changed')
+
+    expect(lastViews().content.setBounds).toHaveBeenLastCalledWith({
+      x: 0,
+      y: POPUP_ORIGIN_BAR_HEIGHT,
+      width: 500,
+      height: 400 - menuBarHeight
+    })
+  })
+
   it('keeps the origin bar isolated with locked-down webPreferences', () => {
     openPopupWithOriginBar(
       { webContents: createFakeWebContents() as never },
diff --git a/src/main/browser/popup-origin-bar-window.ts b/src/main/browser/popup-origin-bar-window.ts
index cfbe3ef3d3b..0786f136c5b 100644
--- a/src/main/browser/popup-origin-bar-window.ts
+++ b/src/main/browser/popup-origin-bar-window.ts
@@ -155,7 +155,9 @@ export function openPopupWithOriginBar(
       : {}),
     minWidth: MIN_POPUP_CONTENT_WIDTH,
     minHeight: MIN_POPUP_CONTENT_HEIGHT + POPUP_ORIGIN_BAR_HEIGHT,
-    title: initialOrigin.label
+    title: initialOrigin.label,
+    // Why: Windows/Linux attach Orca's app menu to every window, including web popups.
+    autoHideMenuBar: true
   })
 
   // Why: the origin bar renders only Orca's own data: URL and must stay
@@ -184,6 +186,8 @@ export function openPopupWithOriginBar(
     })
   }
   window.on('resize', layoutViews)
+  // Why: Alt-revealing the auto-hidden menu bar shrinks the content area without resizing the window.
+  window.contentView.on('bounds-changed', layoutViews)
   // Why: HTML5 fullscreen makes the whole window fullscreen. resize covers
   // this on macOS, but re-pin on the explicit events too so the origin bar
   // provably stays above fullscreen content on every platform.