But you can. I don't mean with some memory hogging clientside bit twiddling but with the now popular HTML 5 Canvas. So, with a few lines of Greasemonkey code, which you can pull from here, I can now push in image rotate previews back into flickr's organizr. The code has to be run outside greasemonkey land to get full access to the dom data, which I accomplish with the following script insertion.
var _s = document.createElement("script"); _s.appendChild(document.createTextNode(window.myFun.toSource() + "();")); document.body.appendChild(_s);
To tamper with an image, usually to its detriment