"visual diff" for images is broken (BB-9296)
When viewing diff for two images there are options side-by-side, blend and split. It works the first time you select any of those modes after loading the page. If you want to review the image on multiple modes one after another, usually the page just breaks down. Images get distorted and laid over another, blend slider does not disappear etc.
Tested with Opera 12.16 and Firefox 23.0.1.