Firefox will hang on a website then everything else will no longer load and forces me to close and open firefox to get it to work.

As the question says I am having several issues with Firefox lately. I've tried disabling every addon, disabling JavaScript, running it in safe mode - no addons. Nothing seems to work.

I'll be on pandora listening to music, I open a new tab and go to a site like facebook. If that page does not load or hangs, my browser will no longer allow me to go to any other site until I close and open the browser. (Of course closing the tab that caused the issue). This happens about 10+ times every day, and I've supported firefox for years but this issue just keeps getting worse. It started when I upgraded to FireFox 6.