Runescape Constantly Crashing On A Mac?

every-time i open runescape and logg in it rather lags out and closes eveything or goes back to logg in screen, then when you try to logg in it just goes blank ? and its not just my computer its happening to many other people with macs also? whats the go ?
any suggestions ?

 

Happened on my old mac. Extremely annoying. In fact, I bought 2 PCs just because of this problem, the only way to negate it is to have a single window dedicated to runescape...but even then, you can have problems.

 

Yea i use safari for runescape and firefox for everything else... I havent had a problem other than lag and having to shutdown every 4 days or so... Also i have a macbook pro if ur wondering