The page in the URL shows a white flash towards the end of loading (when some Flash content is loading).
Created attachment 61466 [details]
Comment on attachment 61466 [details]
> + as the dimensions, to ensure the layer appers on the correct place.
Typo: “appers on”
> + FloatSize usedSize = m_size;
> + if (m_usingTiledLayer)
> + usedSize = constrainedSize();
I’d write this as
FloatSize usedSize = m_usingTiledLayer ? constrainedSize() : m_size;
but the compiler probably doesn’t care.
*** Bug 42838 has been marked as a duplicate of this bug. ***