Sandboxed Firefox 3.5.2.
Counted down to zero,page went white,waiting.
Firefox prompt to the effect "A script on page is making firefox run slowly,
do you want to abort script?"
Hit "no"
More waiting,tabs unresponsive,same Slow script message,clicked "yes"
Unresponsive,tried to close browser,Windows Prompt:"Program not Responding"
Killed Firefox with task manager,emptied Sandbox.
I guess that is a fail?