SAFARI 6.0.3 crashes/freez in facebook while zoomed in?

Somtimes, while I use Safari on facebook,when I zoom, the whole application stop running complete freeze with the spinning wheel, I've monitored my RAM I'm above 2,5GB free.

When the wheel stops, as soon as I touch the track pad, it freeze directly and the wheel comes again.

Only solution is to force to close safari...

It appen at least once a day.

Any idea what's going on?

OSx10.8.3 - MBP 15 - 8RAM - 2,3Mhz-i7