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I keep getting the message thar Script: js/ff_browser:203 is busy or has stopped working - usually on either Gmail or Facebook - and I want to know what it does and how to stop it.

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This only started happening fairly recently. It happens fairly regularly and randomly. I am usually working on another page on a different tab or webpage at the time. I have tried stopping 3rd party JavaScript, but it seems to make no difference.

I am tired of having to click "Stop Script" all the time. I also have no idea what this script does ... or is supposed to do.

This only started happening fairly recently. It happens fairly regularly and randomly. I am usually working on another page on a different tab or webpage at the time. I have tried stopping 3rd party JavaScript, but it seems to make no difference. I am tired of having to click "Stop Script" all the time. I also have no idea what this script does ... or is supposed to do.

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Try the Firefox SafeMode to see how it works there.
A troubleshooting mode, which disables most Add-ons.
(If you're not using it, switch to the Default Theme.)

  • You can open the Firefox 4/5/6/7 SafeMode by holding the Shft key when you use the Firefox desktop or Start menu shortcut.
  • Or use the Help menu item, click on Restart with Add-ons Disabled... while Firefox is running.

Don't select anything right now, just use "Continue in SafeMode."

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shft key) to open it again.

If it is good in the Firefox SafeMode, your problem is probably caused by an extension, and you need to figure out which one.
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes