This sounds like fun, especially if webpages can use WebGL to read old buffers back into javascript variables - and then AJAX them out silently in the background. (preserveDrawingBuffer + canvas.toDataURL() + ajax ?)<p>Edit: Also, &quot;google chrome incognito mode is apparently not designed to protect you against other users on the same computer&quot;.. what? Isn&#x27;t that the <i>only</i> thing it can and should protect against? It&#x27;s not like it can protect against non-local users (i.e. HTTP network interceptions)