Icedragon crashing system

I’m using IceDragon It periodically freezes my system - I can’t do anything, not even move my mouse- so I have to reboot.

Windows 7 Pro, 64 bit
BitDefender AV Plus 2013
SuperAntiSpyware 5.6.1012
No software Firewall

I’ve been in the computer business for 40+ years & I’ve tried a number of troubleshooting steps without success: Safe Mode; disabling some Extensions- those that I think may be suspect; etc.

I don’t have any problems with Firefox 15.0.1 (previous browser) or IE 9.

Please try to update the Flash version installed if it’s not up-to-date or try the following,
Go to Options, Advanced and disable Enable Malware Domain Filtering if you have it enabled.
Thank you.

Well I was OK for awhile but the ‘freezing’ problem is back- at least 2 or 3 times a day. I have the most current Flash installed & Enable Malware Domain Filtering is unchecked. Would sure appreciate any suggestions. Thank you.

Forgot to mention I’m now using CID 17.0.1.