[kubuntu] Frozen system; stopped script

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http://ubuntuforums.org – I've been having a persistent problem with my Kubuntu 12.10 system locking up, although fortunately the lockup isn't totally solid. I think it has to do with a stopped script in Firefox. Here's the Firefox message: Code: 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: resource://gre/components/nsPrompter.js:434 Does anyone know why this is happening or what I can do to recover from it when it happens? (Hardware)