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Dropdown boxes do not work on Firefox 5.0.

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When using the address bar or any dropdown box on Firefox, the drop down menu flashes but will not stay open so that I can use it. I do not have this issue in IE. I have started Firefox in Safe Mode and the dropdown boxes still did not work.

I can't even use the dropdown box on this form.

When using the address bar or any dropdown box on Firefox, the drop down menu flashes but will not stay open so that I can use it. I do not have this issue in IE. I have started Firefox in Safe Mode and the dropdown boxes still did not work. I can't even use the dropdown box on this form.

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

  1. 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.
  2. Or use the Help menu item, click on Restart with Add-ons Disabled... while Firefox is running.

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