Safari crashes while FF doesn't when playing Divx

I just tried to play a Divx movie in FF and it said there was a missing pluging and proceeds to ask if i wanted to install it. Naturally, i did and the movie played flawlessly after installation. However, Safari is my preferred browser and i tried to play the same movie but it crashes as soon as i click play. I checked to see if the plugin is installed and sure enough, it was.

So why the hiccup. Also found that Safari won't render some sites correctly as FF would. I prefer safari cos its faster and more integrated but recently it seems to be choking the more i push it

 

So pretty much screwed, oh well, i'll alternate between both browsers