Firefox hangs when javascript is enabled; how can I fix this?

I've recently had issues with Firefox hanging when visiting many webpages. With javascripts disabled it does not crash.
Things I have tried:
Refreshing Firefox
Uninstalling and reinstalling Firefox
Using safe mode (did not help, still hangs)
Updating plugins (all were up-to-date)
Interestingly, the same thing happens with the same pages using Safari, but I'm not sure what this means.

I understand that Firefxo is hanging even though you have updated. There was another security release for Flash today as they are addressing some major security issues this week.
I would recommend changing your Flash plugin to a click to play status. Go into about:plugins and click "Always Ask to Activate" for your flash player.

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