Comment 2 for bug 1551524

This sounds like a duplicate of bug 1544825. Which is where because of all the tabs being loaded, the request for the images on the non-visible tabs are sent to the thumbnailer. I'm not sure where abouts in the stack this should be prevented as the Image object is not visible, should the Image.visible=false be enough to stop the call? Should the image provider (thumbnailer) itself stop it when the image is not visible?

However it should be noted our Image are async, so this won't block the UI while it is waiting for the response.