Reminds me that all browsers (except opera presto) conserves all images from the current page in raw pixel (or BMP) format in memory, whether they're currently shown on screen or not. There has been a few bug reports (OOM) in firefox 4 (and the chrome version of the time) that got never fixed.

I had a page that was showing a few thousands DVD covers (in jpg, around full hd resolution), it crashed all browsers except opera presto.