Steaming Apple keynotes freezes computer?

As the keynote is coming up I was hoping to watch it but realised that my hackintosh can't seem to handle streaming Apple keynotes in Safari.

When I tried to open the WWDC livestream a few months ago my whole computer crashed, the only way to fix it was to force shutdown my computer by holding the power button down.

Has anyone else had this issue? and is there a fix for it?