When deleting the browser history, about 90% of the time the computer freezes up for half a minute, and then this message appears:
"A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.
Script: chrome://browser/content/sanitize.js:135"
Sometimes it takes several tries before deleting history works normally again.
Also, quite randomly, the hard drive will access at 100%, and
the computer is made useless for about 10-20 minutes.
Nothing else is running in the background except Acrobat Updater, I believe.
No toolbars or other crap.
I'm using FireFox 10.0.2 with NoScript and BetterPrivacy(for LSO).
Also using Malware Bytes and Microsoft Essentials(update set to 30% max CPU).