This is broken out of bug #38443. The page has an iframe with Flash video that uses wmode=transparent so that the page's menu can use a higher z-index to composite on top of the video. However, if hardware accelerated compositing is enabled, the menu appears under the Flash video rather than overlaying it.
- Ensure accelerated compositing is enabled
- Open the above page
- Mouse over the text "HOME", which should show a menu on top of the Flash video
If hardware acceleration is disabled, the menu overlays the video.
*** This bug has been marked as a duplicate of bug 41330 ***