Ok, sure, the topic was a little bit of a clickbait because we cant actually fix this ourself but we CAN contact Apple, or atleast all of us that is experience this issue can atleast send our feedback to:
http://www.apple.com/feedback/safari.html
This is getting very frustrating, several times per day i need to force reboot 2 of my Macs (Late 2009 iMac and the latest rMBP), the only Mac i have that is not freezing when i am using Safari is a early 2008 MBP, kinda weird, the oldest Mac i have works flawlessly in El Cap.
I have seen several threads about this issue in various forums, there is one active thread about it on Macrumors and several replies about ut in the El Cap bug thread so i am not alone.
The bug is kinda weird because the Safari freezes the computer, kinda, the music still plays, the videos still plays and i can move my pointer but it does not register ANY mouseclicks/taps.
So, everyone that has this problem & don´t have send some feedback to Apple, please do it, explain the issue and your hardware setup.
UPDATE 2016-11-30